The X-Men franchise was on a real streak until Brett Ratner replaced Bryan Singer for X-Men: The Last Stand. While plenty of X-Men movies are in the works, including a X-Men Origins: Wolverine sequel, a Deadpool spin-off, X-Men: First Class, and possibly X-Men Origins: Magneto, no X-Men 4 has been announced. Singer has hinted at a return to the franchise, while Ratner told MTV that he won't direct another X-Men ... and then quickly ammending that he might:
The thing with the X-Men universe is, I feel like I've already done it. Certain things I would go after, and certain things only if the script is great.
First Ratner feels like he's "done it," then he says "only if the script is great." Don't forget, this is the director of all three Rush Hour movies. Clearly, sequels are not an issue:
I heard a rumor that they were going to do a young X-Men [X-Men: First Class], which would be great. I would love to see a Magneto movie personally, because I love the Holocaust backstory. I'd love to see a Storm movie, too.
Basically, if you write it, Ratner will make it. So who would Ratner pick to make another X-Men?
I'd love to see [Steven] Spielberg do it. A Spielberg X-Men movie would be something I'd love to see.