When Matthew Vaughn gave the X-Men movie saga a shakeup with the prequel First Class, he had a grand plan to usher in a new trilogy of young X-heroes. Then Kingsman blew up, and he chose to guide Eggsy and his friends over Charles Xaviers’ merry mutants. But what could’ve been? Something that sounds a lot more…
Source: io9 – Fox Wanting Days of Future Past Right After First Class Is Why Matthew Vaughn Left the X-Men