I had a feeling this was going to happen.
First thought, Michigan has a little bit of a history of "running away" when Notre Dame gets good. I found it interesting that Michigan sat down to talk about extending the series in 2007. After perhaps Notre Dame's worst season ever. What a coincidence.
Now with the Irish stock seemingly on the rise with a proven coach like Brian Kelly, no wonder Michigan is backing off.
More importantly, I felt like Michigan wasn't going to put up with an expanded Big Ten with Nebraska (and other new teams in the future) added to playing Ohio State AND Notre Dame every year.
Out of all the Big Ten teams I thought Michigan had the money and balls to walk away from this series, whereas Purdue and MSU simply need us on the schedule every year.
Maybe it's only a 2-year break, but I wouldn't be surprised if the games between Michigan & Notre Dame get less frequent over the next couple decades.