I don't see the issue. What's wrong with changing the main character to be gay? Because, I don't know, they can and because it doesn't truly affect the core of the character. I would feel a bit weird for the sexual orientation of a big character, lets say, Magneto or Wolverine to change, but minor characters, like Iceman, I'd be totally open (Iceman's homossexuality is directly supported by the comics, which only make it more likely to appear in future reincarnations of the character).