Everyone saying they will be worse when Stoudemire comes back, but they also have the option to move Stoudemire if things don't workout when he does return.
I think the Knicks could work well with both Stoudemire and Melo, and I think having Jason Kidd as the point guard is a key for Stoudemire, who hasn't really had an effective point guard since he left the Suns and Steve Nash to join New York.
The market for Amar'e Stoudemire may not be what it once was, but they could still get something for him. I'm sure they are interested to see how well he can play with Kidd, Melo, and company this year, however.