If Michigan were to ever drop Notre Dame from its schedule, what teams do you think we could replace them with that would instantly create a heated rivalry (given that we play a home and home with them every year for 30-odd years)?
Off the top of my head, I think a new series with:
Mich v Southern Cal
Mich v Tennessee
Mich v West Virginia
would without a doubt re-create the OOC rivalry atmosphere with Notre Dame. Not saying any of this is likely, just fun to think about which matchups that would bring bad blood between the schools.