The problem has always been the DEFENSE. DAntoni's "system" is all about scoring with less emphasis on TEAM defense.
When Melo was out, the Knicks played defense as a unit, with Chandler holding up the middle. Its not a coincidence that as soon as Amare came back they started faltering, and once Melo returned to compound the lack of defensive intensity, their mojo started to dwindle.
Lin, Melo, & Stat are all HORRIBLE defensively, and that lack of harmony then extends to the offensive end.
They need a new coach- DAntoni's system is too limited. If a new HC comes in & they still struggle, then its time to look at trading either Melo, or Stat, or both.