Throw in the fact that Patrick Stewart is willing to play Professor X in a Deadpool movie, and we could potentially see a way to get Deadpool, the X-Men, and The Avengers in a cohesive universe together.
Of course, it’s also worth mentioning the fact that Hugh Jackman has similarly waffled on his commitment to retiring from the role of Wolverine as well.
The man behind the clawed badass made it abundantly clear that he is done portraying Wolverine in the X-Men universe, but he also recently added the caveat that he would stick around if the X-Men franchise and the Marvel Cinematic Universe crossover at some point.
Obviously, a large number of things would need to go right for this to happen, but the framework is certainly there if 20th Century Fox and Marvel Studios ever decide that they want to work together on this.