If ND is going to join a conference, and if they have been formally offered membership in the Big Ten, I think this is the opportunity they need to take. They could join the ACC, but in my opinion, that conference is on shaky ground. If they prefer joining the ACC, they need to have plenty of opt-outs available to them because I believe the next domino to fall is the SEC raiding the ACC for Miami, Florida St, Clemson and possibly Georgia Tech.