This seems like a logical fallacy.
A) Garrett was the playcaller, not Linehan
B) Murray WAS productive against the Packers. So how does the loss of Murray or Murray's productivity have anything to do with giving up on the run. Garrett didn't quit running because the running game failed. He quit running because he was Garrett. Behind in blowouts, ahead in blowouts, tied, early in the game, overtime, Garrett always abandoned the run.
C) Committment to the run means running even when it's not necessarily yielding big gains. We did that this year. Unlike any other year, with Linehan and Martin being the only variables from previous pass-happy seasons (both of which are still here.)