I feel like part of the problem is that Michigan fans have high expectations. They have a tradition of winning and will accept nothing less than the best. Their best season in the past 10 years or so was 2011 when they won the Sugar Bowl. They went on to an 8 win season (highlighted by a outback bowl appearance
) then a 7 win season and a loss in some crappy bowl. A lot of it is UM fans being pissed off with having a mediocre team. Therefore, they have stopped going to games. Then, just like all teams, it's getting tough competing with HDTV.