Originally Posted by Zarex
I'm not sure whether or not a crossover is possible under the existing contracts. But with Milllar backtracking my guess that it is, at the very least, a grey area. Marvel sold the rights separately and could argue that combining the two separate character families is contrary to the spirit of the original agreements.
Due to horribly lopsided contracts Marvel signed in the late 90s, Marvel is making next to nothing from the X-Men characters and have little incentive to assist in the success of FOX's X-Men series. In fact, it is in Disney's best interests for the series to fail so that the character rights revert. Sony cut a deal with Disney/Marvel that put the two studios on good terms, so hopefully a similar deal will be cut with FOX and put us closer to the "one big happy family" scenario.
Avi Arad's face lit up when the idea of Spidey/Avengers film was brought up. He dreams of all the money he could be bathing in.