User blog comment:Black Leg Sanji/Chapter 648 Prediction/@comment-1503157-20111129215729

Almost everyone wants Jinbe to join. I don't really think he will. He might get on well with Luffy, but I can't see a reason for him joining the crew any more than Dorry and Brogy (for example) did. It's not like they need another fighter, adding him would only make the training mean less than what it should. Fishman Island was really easy for them, now we have to see the true limits they have reached.

Anyway, I don't think they'll leave so soon after the battle. 2 or 3 chapters left I'd bet.