Since Deadpool’s post credits scene set up Cable’s introduction, perhaps another robe clad Deadpool will tease his girlfriend’s burgeoning abilities in a similar way.
Development for Deadpool 2 is still very early, although I doubt that Copycat would be used in the first sequel.
Instead, it would be interesting to see Vanessa perhaps discovering her mutant abilities toward the end of the film, even as a tease for the threequel.
The movie already has major shoes to fill, and the addition of complicated characters like Cable.