Re: Changing the roster for Avengers 2?
Hell, us Marvelphile comic book fans have been asking those very questions of Stan Lee himself for decades --- where were the Avengers when the X-Men were out saving the world, and vice versa?
As it stands right now, the three major studios pretty much have the same divisions that we see in the comic books --- Avengers are doing their own thing, while the X-Men are doing *their* thing, and the Fantastic Four their own thing, and Spidey his own thing. They rarely met in the comics except for the occasional multi-title crossover; until Civil War/The Bendis Era tried to homogenize all superheroes into a single Initiative.
THE COTTON AVENGERS
...They move like slick cotton on oil.