Notre Dame might go...but what is in it for them? They get 5 ACC games annually, Stanford, USC, Navy. 8 annual games there. Plus another marquee matchup against a big name (currently have Michigan, UGA, TAMU, Alabama, Ohio State, Wisconsin) lined up. This year appears to prove an elite season by them gets them into the CFP so...why give that up?
They've turned down the B1G multiple times in the past. I'd expect ND to end up full-time ACC before going B1G. And if ND goes ACC, I can't imagine North Carolina or Virginia leaving.