Unless Miami is able to attract some other top notch free agents, like Bosh, LeBron, Dirk, etc.. then I could definitely see Wade going elsewhere.
Right now, Miami has stripped down their roster to nothing. Bosh is the one I think they have the best shot at landing. If he comes in with Wade and maybe Boozer, then I think wade stays, but if Bosh goes to NY/NJ or Dallas, then I think wade Bolts. He is tired of carrying that franchise on his back.
LBJ appears to be staying in Cleavland or going to Chicago. Dirk will stay in Dallas. Bosh will either go with LeBron, unless LeBron stays in Cleavland, then he probably goes with Wade. I think Chicago is the most attractive.
If LeBron stays in Cleavland, then he is a liar. He will become the Patrick Ewing of Cleavland. No rings. If he wants to win big, he will go to Chicago. They could make another Jordan like Run with Bosh, LeBron, Rose, Noah, Gibson, etc...