I don't think he should be hammered, but this was THE YEAR for Michigan, except it wasn't. They failed to meet expectations, that always leads to problems for a coach, particularly if that is a trend. Michigan has high expectations and they are not being met, obviously. They can't do a "Minnesota" or "Baylor" because of those expectations.
SO, they either modify their expectations are continue to be disappointed, unless something significant happens. Do folks think they will be better next season?
The may well face Florida in a bowl game and a loss there ....