A lot of Knicks fans harp on Dolan and the Knicks for being impatient and making rash decisions, but I see a lot of posters here who are just as impatient. Players don't develop as fast as you think they will! Look at player like Deandre Jordan, Isaiah Thomas, or Jeff Green (I know he's not that great but still.) Their ages are 25, 25, and 27 respectively. They all only really became good when they were 25 or older. Development takes time by its very nature. Sometimes lots and lots of time. Fine, time is something that the Knicks have if nothing else. If Shumpert does not reach his potential until he's 25 then that's fine.
For a comparison, Shumpert's stats are strikingly similar to a certain Harrison Barnes, a player I'm sure that the majority of people on this site would value highly (Shumpert also averages less minutes).
As terribly as Shumpert has played for the majority of the season and including his many games that are complete duds, he is still averaging, per 36 minutes:
9.3 points, 6.0 rebounds, 2.4 assists, 1.6 steals while displaying at least great defensive potential.
Again, improvement happens gradually, and often, not until an off season. The point is that two straight turnovers doesn't mean Shumpert is trash, just as two straight threes doesn't mean Shumpert is "back".
Shumpert is one of the few Knicks with potential and who can be considered an asset. The Knicks should be looking to acquire and keep assets, not dump them in a desperate attempt to save an already lost season.