These conferences can't agree on anything. They aren't going to throw all the FB helmets in a pile and choose up four 16 or 18 team leagues.
You are much more likely to get the top 8 FB powers and their designated little brothers pulling away to for a super league, but that isn't happening either with all the geographic, political, and traditional ties. It be like a coin coming up heads 64-72 times in a row. Then there is the little matter of not wanting to be buried in a league with too may other strong programs because someone is going 5-7 in any league.
The best you'll see is a consortium of the P4 adding TX and OU for the college playoff payouts, the B12 will be shut out and the other conferences MIGHT cherry pick some of the other programs. No one is getting kicked out of a P4 league unless the top 32 or so programs decided to go it alone. But, that would be like heads coming up 32 times in a row.