The B1G would need to go to at least 24 teams if it wanted to get into the South. Do you really think they go that route when they can let the ACC survive and not allow the SEC to get into VA and NC which would hurt the B1G's move South? What good is moving South to have the 2nd fiddle in each state?
The only real way for the B1G to hurt the SEC is for them to take the best ACC, B12, and P12 schools available plus the low hanging SEC fruit. Then only play each other all 12 games and don't participate in the playoffs, only have a 8 team B1G tournament with the B1G CG being at the Rose Bowl. But the chances of that happening are very slim.
About a decade ago, before the BT added Maryland and then Rutgers, Jim Delaney said in public that the BT was studying expansion and that included numbers of more than 16 members.
The BT always has been filthy rich. It has never needed ND to be filthy rich. All the BT needs now is an upgrade in football talent to be as good as the SEC.
Yes, I do think that the BT would expand to at least 20 to get into the South in enough states to rival the SEC for signing top Southern recruits.
I also think the SEC will expand to at least 20 in order to make certain the BT cannot get a sound footing in the South.
Let me show you how it works: if UNC were nuts enough to want to leave Dook behind, and UNC and UVA agreed to go to the BT whore, that would not help BT football any. That is only 2 states, and neither has anywhere near the talent of FL or GA. Worse, the SEC then could take VT and NCSU and neutralize all that the BT got with UNC and UVA.
So to get even UNC and UVA, the BT is going to have to agree to take VT, Dook, and NCSU. If the BT is at 19, it will then be stupid not to add Clemson, which is a monster program located 80 miles from GA.
The SEC is not going to sit still and allow that to happen. The SEC will act to protect its eastern side. The SEC knows that ND in the BT will never hurt SEC football in any way, but even those 6 ACC schools in the BT would hurt SEC football by opening up the South in a huge way to BT recruiting.
And if that BT will go to 20, why not add GT, FSU, and Miami to deep planted firmly in the Deep South and really make the SEC sweat.