What really remains to be seen with the GOR is whether the courts would allow the conferences to seek specific performance of the contract upon breach by a departing school. If not, then the GOR simply becomes a measure of damages, namely the value of the media rights the school signed over to the conference. The real risk of that model is that it varies by school, and that it declines every year. It's not much different than an exit fee, except that shrinks over time.
I think it is relatively unlikely that the courts would require specific performance and actually let the conference retain the media rights of a departing member. It simply won't happen. Instead they will be compensated for the loss of those rights by the school. Just one lawyer's opinion. But if I am right, then as the GORs get closer to their end date, the cost of breaking them becomes much more reasonable to a departing school.