I feel like they don't have to tell an origin movie again. In the comics it has more than 10 years that Xavier is not part of any X-Men team at all. I think since 2004 in the comics, Xavier is not part of the x-men. When he was alive before he died in 2012 in the Avengers vs X-Men seires, he used to visit the X-men at Utopia from time to time but he was no longer in charge and just a guest there. All the leadership went to Cyclops. Last year they brought Xavier back to life in the comics but he didn't interacted too much with other characters and kept as a secret to everyone that his back to life.
Is time for them to distance themselves to Xavier, Magneto, Mystique and Wolverine. Which by the way none of them were part of the x-men in the new volume of Uncanny X-Men released last year. They do appear in the series but not as X-Men (except Xavier which is still living in secret).
My point being, they could easily make a "Uncanny X-Men" movie
without Mystique, Xavier, Magneto and Wolverine.
Did anyone read X-Men Red? It had none of these characters and it was amazing.
The team was: Jean Grey (team leader), Storm, Nightcrawler, X-23 called by the name "Wolverine" in memory of Logan, Honey Badger, Gentle, Trinary, Gambit and Namor.
X-Men Red - Wikipedia