I definitely see Ziggler, Del Rio, Swagger, and even Sheamus leaving once their contracts expire. WWE is slowly phasing out the guys who came under John Laurinaitis for the new breed of NXT signings. Not that there's anything wrong with that but they've completely wasted some of these guys when some of them could have been established stars.
They've done this before with phasing out some of JR and Cornette's signings and prospects. Nothing new.