Most of us would love to see the X-Men characters crossover into the Marvel movie universe. It's something we never really thought would happen due to the fact that the rights to the X-Men characters belong to Fox, but that doesn't mean the producers of the films don't want to see it happen. When X-Men producer Lauren Shuler Donner was asked if she could see a "world where this generation of X-Men could be in an Avengers movie," she responded with the following,
I would love it. I would love it. I personally have close ties to Marvel because of Kevin Feige, because Kevin worked for me. But to take our characters and mingle them in the way that they were written, yeah, absolutely.
I hope something like this eventually happens! I guess there's always a chance, especially if the two parties have close ties, and are willing to work together on making it happen. It'd be awesome to see Marvel's phase three or four plans include some X-Men characters!
Do you think we will ever see The X-Men and Avengers team up in the same movie? I do, but not for a very long time. Make it happen people!