It's unlikely to ever happen but one can dream - Marvel, Sony and Fox coming together to work out a deal to create one cohesive Marvel Cinematic Universe. Where the Avengers can share the screen with the X-Men. Where Hulk can face off with Wolverine. The studios would then be able to adapt huge Marvel crossover event films like this one, 2005's
"House of M". Click below for this fan made teaser trailer.