I think Dolan wanted to get rid of Thibs to begin with (apparently decades of dumb decisions have not persuaded him that he should let other people make the decisions) and whatever Bridges (I suspect it was Bridges) said was the excuse he was looking for.
It will be ironic when next year's coach has a bench of Yabusele, Clarkson, McBride, either Hart, Bridges or Robinson, and second-year Kolek, Dadiet and Huckporti and people say "see, Thibs should have played his bench more!"
Maybe if Thibs had that bench he would have.
I do agree that the Knicks offense was stagnant and did not involve enough players. However I question whether that is due to Thibs or because your point guard holds the ball for 6 seconds, gives it up, gets it back, and keeps it for another 6 seconds. Possibly a new offensive approach will change that, but then again possibly it won't. It will be interesting to see what happens on that front. But as long as you are going to run a Brunson-centric offense, there will be limited touches for most other players as opposed to a ball-movement offense.