In the pantheon of storied rivalries, it's a ways down the list. They've met, what, 40ish times in 120 years? It's a matchup that's been played in recent history between two historically relevant programs. Let's not make it out to be more than it really is. If you're Notre Dame, there's really no incentive to play this game. If they have to play 5 ACC games, Stanford and USC, why should they keep Michigan, too. No other team in the country willingly puts themselves through that.