Its a possibility but I don't think he will walk or even hit the open market. I think he opts out and extends next offseason before FA starts. Money wise its his best. The Knicks are a legit threat to steal him. And honestly I think with development from Nkilakina and Knox, along with dominance from Porzingis they would vault to #2 in the East.
As far wanting him to stay or go. I absolutely dont want to lose. We have a nice PG behind him in Rozier, but the difference between Irving and Rozier was the difference between losing in the ECF to a weak Cavs team VS being legit contenders. Irving may be only behind Curry in terms of the most skilled scoring PG's in the game. And while he has never been a great facilitator, our puts facilitation on 5 players ( much like GS) and that makes up for it.