They do finally have many of the classic X-men in the next movie, although rumours of delays do not bode well. If Marvel makes a successful movie then maybe it might jump start something but we got Logan from the Wolverine and nobody from Days of Future Past, which was well received.
I hope Marvel doesn't break stride with the X-men. They could recast if they wanted but the X-men require no origin story, much the same as the Hulk. As long as they don't use characters that have died, without explanation, and cast adults, not children as the core X-men that have featured to date, there are plenty of X villains they could use even if Magneto and Mystique never appeared again. That said, making Aunt May 'hot' and putting Peter back at school clearly rebooted Spiderman again so it could go either way. It's not as if the X-men are not as popular as the Avengers. I'm sure Cyclops is as popular as Hawkeye for example. There must be some other reason why they made the choice not to bother.
