I can't believe that keeping him is even a serious consideration. I was in a weird place coming into this season. If we had gone .500 in the B1G, made the tourney, and been one and done I would still have felt like he had a very fire-worthy four year track record, but also felt like it would be weird to fire a coach in a year we made the tourney (didn't stop us from doing it Tubby, plus Tubby won a tourney game that year, and assuming we don't win the BTT, Ben would need to make the tourney 3 times in the next 2 years to match Tubby's success rate for getting in).
So if we bring back Ben, then what? If we miss the tourney again, we've just wasted another year. If we sneak into the tourney, what do we do? If on the day we hired a coach, you asked me what we should we do if five years in we only made the tournament 1 time and would have a B1G winning percentage south of 35%, id unequivocally say you fire the coach at that point. But I'd still feel weird saying fire the coach the year he was in the dance. So I'd probably be entering year 6 saying that missing the tourney should be the end of the line.