I think they'll get rid of Cavani either way to be honest. All he has to do is to push for a move. He lost his place to Lucas Moura this season, and he hasn't performed as a striker when he's been given the chance. With the kind of money PSG have it makes sense to go after someone like Higuain or Lewandowski when it's time to replace Zlatan... players who already perform at a desired level.
There could be an opportunity here for a club like Arsenal, actually. I'd happily take Cavani off their hands.