Well, this was disappointing. And by all accounts, New Mutants will be worse. Send New Mutants to Disney+ and let Disney reboot the X-Men in a much better way.
IMO, I'd have the X-Men's origin stories play out on Disney+ and Hulu with future seasons happening depending on the character during Phase 4. Then assemble the two main X-Men teams and X-Factor come Phase 5. I'd make Falcon and Winter Soldier feature the Grand Director and US Agent so Weapon X can be introduced (No more IGH shenanigans, the REAL Weapon X which IGH was originally spun-off from). Mister Sinister would be the Thanos for the X-Men side of then MCU but Stryfe would be the first major villain to bring all the X-Men teams together.
TV Shows which would set up the X-Men in the MCU
Wolverine (Hulu ongoing series due to violence) Tells the story of Patch Logan working for Jessan Hoan on Madripoor and how he begins to recover his memories due to encounters with Maverick and Omega Red. If there's a second Season, use it to set up Alpha Flight.
Cyclops (Disney+ miniseries) - After a plane crashes in Alaska, Scott and Alex Summers survive only to discover that they have incredible powers and while the military decide to keep Alex for themselves under the command of Raven Darkholme and Valerie Cooper, a man named Charles Xavier is able to take Scott into his care to study him and help him learn to control his abilities as Charles failed to do with his own son. Scott fights the Vanisher after he steals Xavier's research.
Storm (Disney+ miniseries) - Ororo Munroe is a Kenyan woman backpacking across Africa who encounters a telepath named Amal Farouk. Ororo learns to break free of his control and now must do battle with his disembodied psychic form after killing him only to be rescued by Charles Xavier.
Psylocke (Disney+ miniseries) - Betsy Braddock was chosen by Merlin to become Captain Britain but passed the torch to her half-brother Brian because elements of British society wouldn't let a half-Japanese woman be their country's greatest hero. Psylocke creates her own name for herself and proves herself to be a hero on her own terms by defeating the crime boss Vixen and her ally Mad Jim Jaspers. Would also set up an Excalibur film series.
Archangel (Disney+ miniseries) - Warren Worthington III is the billionaire heir and CEO of Worthinton Industries. He stays out of the public eye after a falling out with his old friend Cameron Hodge over his wings and healing powers and become a reclusive business executive who hides his wings as a secret. After an encounter with Candy Southern who sees him in person and isn't scared of his wings, Warren decides to go public with his appearance. This series wouldn't have a supervillain to fight, it would be a pure romance with Candy teaching Warren to love himself again and from there to use his fortune to fund Charles Xavier's new school and team of superheroes. Hodge would later become a supervillain down the line but that's once X-Force would be established in Phase 6. Hodge still is the one to kill Candy before fleeing to Genosha which makes the story a tragedy. Candy's last words are, "They're not all like him. I want you to still believe in people." It's just a genuine tragic romance story which would be completely different for the MCU and show that there are stories to tell in that world which are completely different from normal superhero tales.
Jean Grey (Disney+ miniseries) - After Jean saw her best friend die in front of her as a child, she began hearing voices. Ones which years of therapy and medication couldn't stop her from hearing. She always thought her house was haunted after objects moved by themselves. It's only after Jean in college over in new York City meets Jessica Jones who convinces Jean that there are plenty of other people like her and they aren't all Avengers. Meanwhile, Charles' Xavier's stepbrother Cain Marko makes a pact with a demon for power after breaking into the Sanctum Sanctorum and becomes the avatar of Cytorrak to seek vengeance on Charles for not allowing him onto the team he's building. After the Juggernaut goes on a rampage in the Bronx outside Jean's window, Jean teams up with Misty Knight to stop the Juggernaut only to follow him to upstate New York where she does battle with him at the site of the school Charles Xavier is building. Jean stops Cain by first psychically breaking off his helmet and then getting into his mind itself and forcing him to surrender. Xavier allows her onto the team.
Bishop (Disney+ miniseries) - Lucas Bishop is interned in an internment camp for mutants, aliens and other super-powered beings in Australia. Held in a segregated cell block for Aborigines and branded with an M over his eye to show that he's a mutant, Bishop eventually is freed by his sister, Shard. Together they want a world without Sentinels. Naming themselves after the 21st Century's greatest heroes, the X-Men, the XSE recruit Archer, Greystone, Malcolm, Randall and Trevor Fitzroy to fight against Ahab and his Hounds as well as Nimrod, a more advanced version of Sentinel. After Ahab is defeated, Fitzroy reveals himself to have been a Hound all along and mentions that he sent a Nimrod-class sentinel to the past before killing Shard, Archer and Greystone. Fitzroy then attempts to visit the past himself and change history but Bishop, Malcolm and Randall stop him and are sent back into the past with him. Fitzroy then kills Malcolm and Randall before Bishop defeats Fitzroy whose last words are, "do you know how they X-Men died? They were betrayed from within, just like I did to you." Bishop then vows to prevent his future from ever occurring and seeks to save the X-Men from themselves.
Beast (Disney+ miniseries) - A scientist working for Roxxon in Chicago is the perfect human specimen. Gifted with superhuman strength, agility and intelligence, Dr. Hank McCoy simply wishes to be normal. Hank works with Linda Donaldson (who's his lover) and Carl Maddicks to isolate the cause of mutations in the hope of curing people who may have superhuman abilities which they never desired. Upon learning that his fellow researchers are secretly working for HYDRA and plan on using the research to create super soldiers, Hank decides to cure himself so he'll no longer be a test subject. Naturally, this instead induces a secondary mutation and causes him to become a blue, furry creature with sharp claws and fangs. Hank then steals the research from Maddicks and destroys it. Donaldson reacts with horror and says that she never realized that Hank was a monster. Hank simply says, "I could say the same about you." Hank then leaves to go join Xavier's new team where he can continue his research ethically.
Thunderbird and Warpath (Hulu miniseries due to violence) - Brothers and Navy SEALs John (codename Thunderbird) and Jim (codename Warpath) Proudstar are on shore leave where they go to visit their mother on the Apache reservation in Arizona. John was blessed with super strength and near invulnerability. Jim has enhanced reflexes and flight. Upon learning that their mother got a fast-acting cancer which killed her in a number of weeks, John and Jim then hear that there were a number of strange cancer diagnoses as of late and that the closest hospital is likely the cause. It turns out that the hospital is run by HYDRA and that the researcher in charge, Dr. Edwin Martynec is trying to recreate Hank McCoy's research. Martynec eventually transforms himself into a creature just like Beast and is killed by John and Jim. John then says that his time in the military is almost over and he's heard about a team of heroes being assembled where he feels he can do more good since he's not the type to ever give up fighting but that if anything happens to him, he wants Jim to take his place on the team, even if that means going AWOL.
Magneto (Hulu miniseries due to violence) - A young Erik Lensherr in the 1980s is ordered to invade Lebanon. Young Erik witnesses horrific brutality on all sides of the conflict and even participates in a number of atrocities. Erik falls in love with a young soldier named Magda who becomes his only true tie to his humanity and keeps his dark side in line. After Erik's powers activate in the heat of battle, he begins to see himself as more of a weapon than a man. His own government begins calling him, "Magneto" and treating him as a piece of equipment. Magneto is seen as a hero to Israel and as pure evil by the Syrians and he only manages to give up war when he's ordered to return home and is only able to do so because Magda's unit is also returning. Fast forward to the year 2000 when Magneto now has a family with Magda who he's eating dinner in Jerusalem with. He talks first about how he traveled Eastern Europe in the 90s before he felt the need to return to Israel because he needed Magda back in his life and about the importance of Israel and how every people deserve a homeland and when Anya asks, "are there still people who hate us" a suicide bomb goes off and kills Magda and Anya. Erik gets the same look in his eye when he first became Magneto and as gunfire erupts around him.
That's the first wave needed before the first MCU X-Men film, which would hopefully be based on Mutant Genesis. Magneto appears to be the villain for the first two acts but he's framed by Fabian Cortez and only ever wanted Avalon to be a mutant homeland. Cassandra Nova would be reimagined as a government bureaucrat who naturally destroys Asteroid M with nuclear weapons despite knowing that Magneto wasn't actually a threat. Cyclops sees himself as the new Steve Rogers but it turns out that he's actually far less competent and manages to get Archangel blown out of the sky in the first act where his body is never even recovered and Fabian Cortez kills Thunderbird on Asteroid M which allows Cortez to escape without any sort of consequence. Millions perish on Avalon and the X-Men are forced to watch while Magneto joins the X-Men because he simply has nowhere else to go and because being a superhero and fighting evil are in his nature since he simply wants the violence. He doesn't so much want to become a hero at the end as much as he wants a chance to kill people and get away with it. It would set the X-Men up as a very different kind of team from the Avengers and ram home why Cyclops will drive the X-Men so hard in the Danger Room.