Creative and storytelling debates aside...
If a situation ever happened where Feige/Disney/Marvel were making X-Men films, it's kind of crazy to think they would not be essentially making a new universe of films with X-Men. That's landing on a new gold mine for them, and they won't make their cash by just having only one film. Otherwise it's of little use to them as a whole. X-Men is not a solo character IP. There's over 20 potential series of films in there.
They would produce multiple X-Men team films green lit fast. Building to a new larger film universe as well as X-Men crossovers, Avenger crossovers, Disney XD cartoons, Disney infinite, characters in tv shows and an insane amount of merch. We are getting 2 Spidey films in the next 3 years and a Star Wars film every single year because they know what they got and don't like to sit on what can be potential money. They were announced almost instantly when a deal was made to acquire the characters. They would be fools to not even have a plan for X-Men as we speak in case a situation presents itself and Fox wants to play ball.
X-Men is big, and Feige is well aware on how to make the most money out of them for the studio. He might not put together films Singer fans like, but he knows the X-Men universe more then any other studio head. When it comes to connecting, expanding and marketing that's where Marvel no doubt holds a clear advantage over other studios. I don't see why X-Men would be any exception.