It's easy and
safe to say now that "the characters who are gay in the movies should be the ones gay in the comics" when you know for a fact that 95% of the main and most important characters are straight. When you know the gay characters will be "Valkyries" with their 15 minutes of screentime while the straight characters will have 5 times more. When gay characters will be "Valkyries" with their sexuality slightly implied, while straight couples and romances explode everywhere. It's easy to claim for more inclusion when you know those minorities won't have the same space and importance than the other characters. It's super easy like that.
It's also very well worth mentioning that most of the LGBT characters in the comics weren't LGBT at first. They were established as LGBT later (aka ~changed~). If they can be ~changed~ in the comics like Bobby was, why can't they be changed in an adaptation? (keyword: adaptation).
Anyway, it's naive to think Marvel will simply embrace LGBT characters in lead roles right now. And it's because of that reluctance that exists. They haven't even openly embrace them as supporting characters.
When it comes to race, I do believe there will be change to adjust the X-Men to today's standards of diversity. Marvel/Disney has a lot of problems, but I don't see them bringing an 80s concept of diversity. So I do expect those changes from them. Ariel and MJ are already signs of that change. But when it comes to LGBT characters, they'll keep as "implied" as possible.
And by the way, before saying they do have characters to use and that "Marvel turn Z-Lists into A-Lists, so they can use less popular minority characters". Then good luck to you wishing Cecilia, Anole and Maggot lead roles in the X-Men franchise.
This conversation won't change my mind anyway, so I'm stopping here.
Now,
@Marvel united and
@Mad Ones , I was thinking about Emma recently and, if/when she joins the X-Men in the MCU, do you think it's essencial for her to be in a relationship with Scott, or do you think it can work without their relationship on screen?