Since Marvel, I presume, still holds all the rights; what are the chances of a film version of those 'specials' you get with alot of the characters fighting alongside in it?
Take the cast from the Xmen, and Toby Maguire to play Spiderman, and the fantastic four cast(well... maybe only Jessica Alba fromt he fantastic four ;0)..etc. and have them teaming up against a common foe like in The Justice League of America- and it would sort of tie the marvel unverse together in the world of films.
Could it work? Probably not Fingers crossed though.
The most likely one would be Spider-man and Daredevil in the same film as they live in the same city and the same "world". They share also villians (like Kingpin). But would you really want that? arguably the best marvel movie franchise mixed up with the shabolic Daredevil? Just watch the Spider-man V.s Daredevil cartoon.
"I'm the Dude! That's what you call me, you know... That or His Dudeness, Duder, El Dudarino..." - The Big Lebowski
"My life is a dark room. One big dark room." - BeetleJuice
Captain Britain! The old one or the modern one. Or Excalibur. Clive Owen or one of the Bond Types could play Captain Britain. Also I'd like to see Dragons Claws or Deaths Head. Also the Silver Surfer (but the script would have to be really good for SS and take itself seriously) Or Secret Wars. Thor would be fun. Or Alpha Flight (now that they've done the X-Men they should let the canadian team have a movie)