There is an interesting potential problem with the Melo situation, though we may never know if it occurred.
The best case for Melo if he wants to win in NYC is to play out this season and then go to NYC as a free agent. In this case, NYC doesn't have to give up much, if anything, to sign him. This gives them more players to put around him or to trade for other pieces.
If the Knicks were to trade to get Melo this season, they would be sacrificing talent for a done deal. The only justification would be their fear that he could possibly sign elsewhere when free agency actually comes around.
To avoid any insecurity on the part of the Knicks and to encourage them to hold on to their talent, it could be tempting to a player like Melo to use leaks to the press from unofficial sources to get word back to the Knicks that he will go there in the offseason so don't panic.
I am not saying that this was done by Melo or intended by Melo, but it is a possibility that would be hard to combat. It is also a practice that should not be tolerated if there were evidence of such a practice unless we are comfortable doing away with all tampering rules.
I mention this because I am firmly behind the right of any player to go to whatever team they want to as a free agent. I also feel that players should be allowed to talk to other players about future moves just as teams are allowed to talk to other teams about moves.
But just as teams are not allowed to put out feelers to players under contract with another team, players should not be allowed to send similar signals to other teams while under contract. I consider intention to be significant here, so I would not include the Chauncey leak about his lack of willingness to play in NJ in the same boat. But, hypothetically speaking, if Melo or his agent were to have had someone leak that he was only going to NY and that is indeed his intention, then that is a problem.
As things stand, we have a situation where everyone knows that NY is the only hope if Denver wants to make a trade. This in itself is not a problem so long as neither Melo nor NY orchestrated the release of information. Even if Melo did orchestrate it all, I'm not sure we could ever get evidence sufficient for a penalty (I would expect the penalty to be fining the player, barring the player from signing with the preferred team, but no other penalty to the team).
Is it possible to prevent players from flouting tampering rules?