They could easily include Gambit and Deadpool in a future X-Men team movie without recasting and retconning the Gambit/Deadpool that we saw in Origins. if this was the comic-books, this wouldn't be a big issue, in fact a lot of things like this happened in the comics.
X-MEN RI5E' MUTANT OF THE MONTH | THE CAMEO | PORTRAYED BY STAN LEE
"I'm Stan Lee" - FF2
"Can I have my shoe back?" - T2
"Superheroes in New York? Give me a break!" - A1
"'Nuff said" - SM3
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