The split if there is one will be at a minimum of 80 teams. This will allow for a reasonable variety of schools and enough teams to truly cover all time zones and major markets. This is all about the Dollar Bill Yo!
As for the Big 12 they are stuck. Oklahoma is stuck because the want out but, they are tied at the hips to Oklahoma State and no one want's both. Texas can go anywhere they want but, they would lose their sweetheart deal with ESPN and have to settle for not being in control. They just can't kneel down for anyone (and that is how they see it). The rest of the conference including Kansas would be in a stand-bye waiting for room status. So the Big 12 continues to limp through the motions. If the Big 12 survives, it will be more of a Central/Mountain time zone conference.
The real changes will be the borders between the B1G and the SEC. With the ACC finally getting a network deal (Of sorts), and their play on the field improving, their position has improved dramatically. The SEC may have to consider to expand with non P5 teams unless they are looking to double down on Oklahoma and Oklahoma State (which they aren't). So perhaps they move into near by large markets. Say Dallas-Fort Worth and Tampa, who knows but if they do drop Vanderbilt and Missouri, that gives them two more slots in which they could move into North Carolina and Virginia. Charlotte and Norfolk are nice metros, just saying.
I've heard there was much complaining about the eastern push by the western B1G members so, I'm thinking they will look to shore up the central portion of the conference with their final 2 schools. Possibly Vanderbilt and Missouri (Yes I now that's wild speculation).
The ACC may look to consolidate their connection with Notre Dame. Any expansion they have will more then likely include Cincinnati with either Navy or UConn.
the PAC is in a terrible spot and can only move in one direction, east. They need to move into Texas. That's the only move that makes sense for them.
I truly believe that USF's best chance at a Power Conference is with the SEC. So we need to win big for a couple years, increase our fan base and donor base as well as our National Perception. Not impossible but, difficult to say the least.