How Marvel Should Bring The X-Men Into The MCU
2. If All Else Fails, Deadpool Can Help
Introducing the X-Men into the MCU is going to be tough no matter how it happens, but if Kevin Feige finds himself in a tricky spot, he can always rely on the Merc with a Mouth himself, Deadpool, to bail him out.
Though it would be extremely foolish for Disney to gimp Deadpool's R-rated appeal and make him a starring character in the PG-13 MCU movies, he could certainly be used in cameo form to paper over any confusion or continuity issues that might arise from the X-Men joining the team.
Introducing blatantly meta elements into the MCU is definitely risky, but Deadpool showing up, making a crack about this being PG-13 land and explaining away any logical issues with the X-Men, namely their being rebooted while Deadpool isn't, could actually be pretty damn funny.
The X-Men series has been perfectly successful up to this point despite continuity being a total mess, so having Deadpool show up to try and make sense of things would at least be a cute way to confront any logical problems head-on.