The house of cards will collapse when the feds investigate tax fraud and chase it back to UM coaches approving expenses. Here's my theory. The guys/gals that Stalions got to attend games were given tickets at a minimum and probably lots more like all expenses for travel, lodging, meals, etc. In addition, filming doesn't make for an enjoyable game so it's most likely they were paid for their time. I assume none of them claimed this income for tax purposes and that opens all the doors, such as Michigan not filing 1099's for contractors that worked for them etc.
This investigation would take a long time, but with the media coverage it's just the type of thing the FBI/IRS love.