The one question I pose

[*pally*]

The refs were only one element contributing to the loss and they did contribute. Marvin's contribution is his continuing inability to have his team ready to perform for 60 minutes. His inability to provide appropriate adjustments at halftime. His inability to keep his players heads in the game for the duration..among other reasons.
Marvin needs to move on simply because it is time. He has taken this team as far as he can. He has shown year after year that he can not coach them to the elite level.