That's absolutely right. If we really want to improve some assets have to be put on the table. I can see Chandler and a few other pieces (draft picks, cash or one or two more players) in a sign in trade with Atlanta for Josh Smith. He'd be a good edition if you think Amare's finished.
Personally, I think we should sit tight now that we've resigned JR. Start Amare, give him 30 mins per game and run the pick and roll. This would be the best case scenario for us. No need to hinder the team defensively by shipping out Chandler. But if Amare can't come back strong then he has no trade value and the only option will be to trade Chandler or Shumpert.