There are very few options for football this fall. It will either be played or it won't. If it is played there might be limited fans or none at all. Michigan notified the world yesterday that there won't be season tickets this year. Which means there might be a limited number of tickets available and/or just student tickets.
I can't imagine the secondary market if they open single game tickets to the general public. I feel bad for those folks that haven't missed a home game since 1965. Their streak most likely is going to come to an end.