I don't know how I feel about this. Kitty Pryde is one of the GOAT X-men in the comic books, but I don't think she can carry a movie by herself. The X-men work best as a team, and more importantly, a family. The movies really need to start focusing more on the "family" aspect and the team dynamic. Most of these characters don't work as solo heroes, and we're more invested in their interactions and relationships among other members of the group. (Wolverine's friendship with Nightcrawler and rivalry with Cyclops, Kitty's romance with Colossus and friendship with Storm, Rogue's romance with Gambit, Cyclops' romance with Jean Grey, etc)
I don't think that there are any X-characters outside Wolverine and Deadpool who are really poppin' enough to carry a whole film by themselves (nope, not even Gambit. Gambit works best as as supporting character IMO, I'll be very surprised if his solo movie actually gets made and is actually well-recieved).
The only thing I can think of in regards to Kitty Pryde is an X-men movie based on "Demon", where Kitty was stuck in the mansion by herself fleeing a stray N'Garai Demon while all of the other X-men were away. It's a longshot (no pun intended), but really, it just looks like they're spinning their wheels at this point in case the Disney deal somehow falls through. IMO the X-men can't come to the MCU soon enough. We're long overdue for some actual costumes.
EDIT: Another option is to make Kitty the POV character in a live action X-men series featuring all the rest of the mutant heroes (much like she was when she first appeared in the comics).