Originally Posted by Great Mind(s)
I don't want them to call X4 "X4" if they do make a sequel with only the future people. That would make DOFP seem like a side project and unimportant. X4 should just be X-Men: With A Subtitle.
They don't even have to include a number anymore. X3's movie title was X-Men: The Last Stand. After that, I doubt they would start including a number again for the movie title.