There was never any chance of this being a Kitty Pryde/Ellen Page headline film. For many more reasons than the popularity of Wolverine. This film began as a sequel to The First Class. The intention was always to focus primarily on its cast and take place in the 1970s. That stayed as it evolved to using the Days of Future past comic as a inspiration, never a direct adaptation. Using the concept of a future X-Man traveling into their younger body gave few options.