The Pac 12 will never come calling, and we aren't getting into the B1G or SEC or ACC.
The Big 12 is our only shot, and I highly doubt they are able to cannibalize the eastern teams.
If they had 4 16-team conferences that's 64 P5 teams. There are currently 64 P5 teams (plus ND). They wouldn't need to invite anybody for that to work. And they sure as heck aren't gonna add 16 G5 to make it up to 80 (5 16team conferences). There aren't 16 teams in that discussion, let alone realistic options