Not to mention that Marvel Studios may want to put some distance between its iteration of the X-Men and the Fox films, which fizzled out at the box office.
Marvel knows people want the X-Men though, so now it’s just a waiting game.
In the past, Kevin Feige has said that it’ll be a while until we see the X-Men, and they aren’t included in the five-year plan that was made prior to their homecoming.
And unlike the Fantastic Four, who can be incorporated at any time, the mutants are a bit more involved and will require some more legwork to explain their existence.