Well we've had this discussion before. Clearly a case can be made that joining the conference has been a positive thing for the university as a whole. For the football program: not so much.
As for Notre Dame, they have zero incentive to join a conference and especially after what's happened this year they have every incentive NOT to.
Notre Dame is the only school in the land that could get away with this...that could stand outside the gravitational pull of the conferences and not be sucked in. That's because as a matter of history and tradition, their brand is golden and has defined college football. Hell, even their friggin' fight song is legendary. They have a huge national following with more people loving them and more people hating them than is the case for any other team in America. That's just the reality.