From The Athletic:
"With the future Playoff format an unknown, and with the revenue disparity set to grow even more now, Notre Dame might likely be leaving serious money on the table by remaining independent. And the new-look Big Ten, with its L.A. additions, would allow Notre Dame the same opportunity to compete across the country that it has now.
The Irish currently house their non-football sports in the ACC, so much of the outside world believes that if they were to move to a conference full-time, it would be the ACC. But the belief among several ACC schools is that that conference is beyond saving — even if Notre Dame were to join for football — and that the only thing holding it together right now is a Grant of Rights through 2035-36, which essentially means that any exiting member would forfeit its media rights revenue until that time. Nevertheless, several ACC schools have been studying the Grant of Rights in the hopes of a legal workaround to minimize the cost of leaving should a lifeboat arrive from another conference."