Despite having a great regular season, winning Sixth Man of The Year and what seemed like Mike fixed his previously bad attitude, J.R will still just be remembered this season for disrespecting the C's and going on a massive slump in the playoffs. So even if he starts playing well next season, there will be always that doubt that he may have a meltdown in the playoffs and not perform.
But what else can the Knicks do, Melo, Chandla' and Stat are eating so much of the cap, that they would be lucky if J.R stayed, they really cannot make all that many moves. They will lose Copeland probably, Prigioni might go back to Europe to play there, Sheed' is done...again.
Stat needs to really earn his paycheck, because right now he is the one holding them back, or rather, his contract. Nobody is crazy enough to go after him, not even the Nets
Nix will get worse next season unless Amare turns back the clock and they become some sort of force, unlikely. While Indiana gets more experience and maybe gets Nate Rob as a backup PG, while Chicago finally gets healthy.