Truthfully, I think I bring some of my personal views on wanting to see more Latinos. I'm Latino-American, so that's why I'd like to see that. I really liked they went with Robbie Reyes as Ghost Rider. I believe there's a pretty good amount of Asian representation in the MU. Agents of Shield is basically a show with two Asian women leads (I think Daisy and May are the most badass characters on that show). Daredevil's had important Asian characters as well. I've heard that the guy who played Shades, on Luke Cage, was Italian even though the character is supposed to be latino.
Kinda sucks that all the Dominican characters I've seen on tv (not just MU)are drug dealers, too. And no name drug dealers who just shot down or passed by during drug deals, in general. But, meh. I guess it is what it is.
I can't say I've noticed any Jewish characters in the MCU. If there are, and they've showed up on tv or movies...then they've hidden it, because I'm drawing a blank if there's any.
And that's literally why Marvel need to do Ghost Rider and Moon Knight series. Marvel proved that they can do Ghost Rider on a TV budget, although if he headlines his own series, he needs a shorter season to spend more money on each episode.
Right now Marvel are in a situation where they're running out of white male leads and need to take more risks with leads of different backgrounds.
When it comes to the film side, Black Widow and War Machine are the only characters who I feel have enough source material to sustain multiple films. Venom over at Sony is a white guy but he's not one whom Marvel own the distribution rights to. There's also talk of Silver Sable who's a Jewish woman but again, over at Sony. Even among supporting characters, the next most obvious choices for additions to the Guardians of the Galaxy are Martyr and Moondragon who are both lesbians and Moondragon is butch enough to shave her head with a straight razor.
Then when it comes to characters more suited to TV, we see a similar pattern where Marvel have simply run out of white men.
Moon Knight - Jewish
Ghost Rider - 2 out of 4 are Hispanic, one of which is also female
She-Hulk - female
Blade - Black and an immigrant
Shang-Chi - Asian
Elektra - Asian and female
And with the New Warriors series, it'll likely focus on teen heroes who aren't part of the Runaways since Squirrel Girl is said to be involved so in addition to characters like Night Thrasher and Sillhouette, it's highly likely that America Chavez and Kamala Khan will show up in the cast. Darkhawk and Speedball will presumably be part of the cast so it's not like people can say that Marvel Studios have given up on white guys. Even with New Warriors, I'd rather Justice and Nova move on to Guardians, not because I want New Warriors to be more diverse but because I feel like Nova and Justice fit the Guardians better and because Nova's powers need a film budget.
The sole exception that I can see is Power Pack which would feature an all-white main cast and that's one that I still feel is better off on TV since I'm not sure how well a PG superhero film would fare and on film, the cast would age to fast + Julie won't wind up in a relationship with Karolina Dean if it were a film. Even then, it would be aimed at so much of a younger audience that it would be mostly stand alone. It's the only option for Marvel on TV that doesn't make the MCU more diverse and even then it wouldn't relate to anything until whoever plays Julie ages up enough that the show gets canceled and she gets added to the cast of Runaways. And half the cast is female anyway.
So it looks like when it comes to future properties, Marvel are literally running out of white guys. Like there's Venom, half the Power Pack and a small fraction of the New Warriors cast. Phase 4 is going to look a whole lot different from what came before simply due to necessity.