LOL, I've yet to meet ANYONE who has read an Inhumans comic. Marvel's certainly taking a risk on that one, but with their track record right now, who could doubt them?
Eternals? Deviants?
That said, it just made sense to do an Inhumans film. Mostly since Captain Marvel is the bridge between Inhumans, Avengers and Guardians. The recent Infinity crossover had Thanos awaken Inhumans across the globe. And then when you look at who Marvel has left to develop, the only properties left to film are Eternals, Ghost Rider, Nova and Darkhawk. Among those, Eternals makes the most sense to come after Infinity War where we can explore how Thanos' own species reacted to his actions. Nova should be introduced in Guardians 3 since it makes more sense to introduce him as part of the team. Ghost Rider wouldn't really fit thematically with gap between both chapters of the fight with Thanos since he's not an Inhuman and it would just be a distraction. Darkhawk is just as obscure as Inhumans but he's one character when Inhumans are a whole team. The other options are would have been a Hulk sequel and a Black Widow film but if the Avengers, Defenders, Guardians, SHIELD and Inhumans were teaming up and Avengers 3 had to be split into two parts, then why either cut out a whole team of characters from the sequel just to develop one character or rush Avengers 3 and have it feel cluttered again, just to develop one character?
I feel like Hulk, Iron and Black Widow can get solo films in Phase 4 while Ghost Rider, Eternals and Darkhawk can also join the MCU.
Phase 4 should be this
She-Hulk, Blade, Moon Knight, Runaways and Punisher can all be done on a TV budget so I didn't include them and if Defenders hits in late 2016 or early 2017, there's no reason why Moon Knight and Punisher can't get their own Netflix series while Runaways can hit ABC Family at any point in time. So Phase 3 can get even bigger and the Phase 4 TV plans to introduce Blade and She-Hulk just ensure that Phase 4 will tap into every major property that Marvel owns. As in every A and B-list IP with the exception of Namor who'd be the Avengers 4 villain before getting his own film in Phase 5. And if FF and Sinister Six fail, I expect an FF reboot in late summer 2023 while Spider-Man would get a Netflix series. And if FF does flop, then Silver Surfer joins Phase 5 as well.
2019
Eternals (August)
Ghost Rider (October)
2020
Thunderbolts: Justice Like Lightning... Hail Hydra (March)
Iron Man: Armor Wars (May)
Hulk: Revenge of the Leader (August)
Darkhawk (December)
2021
Black Widow: Homecoming (February)
Thor: Descent into Hel (May)
Inhumans 2 (July)
Guardians of the Galaxy: Celestial Madonna (November)
2022
Black Panther: Rebellion (March)
Captain Marvel: War of the Marvels (May)
Captain America: Fallen Son (August)
Doctor Strange: Sorcerer Supreme (October)
2023
Mighty Avengers: Atlantis Attacks (May)
West Coast Avengers: Kang Dynasty (December)