I agree with some of this, but there is less than zero chance that ND joins a "dregs of the Pac-12 and ACC leftovers" conference. Sub-zero. It would be financial suicide for them. They don't want to join the ACC the way it is NOW, with FSU, Miami, Clemson, NC, UVA here.
These leftover teams that would remain are the PROBLEM with the ACC and Pac-12 right now. ND isn't going to go where FSU, Miami, Clemson, NC, UVA, USC, UCLA etc ran from and make it THEIR solo problem, where they're the only major draw in the conference and they're giving their $ away to the dregs. This conference would be FAR inferior to the current iterations of both the ACC and Pac-12. They literally would be ND and the XX dwarfs. They wouldn't make nearly HALF what the SEC or B1G bring in. Not a chance. Yay, Washington State vs. Wake Forest in prime time on the Ocho! Lol.
I really think some of the ACC will defect to the Big 12, anyway. They have to for us and our new friends to leave, anyway.