Read this section from the AP article:

"BIG 12 SURVIVAL

If Texas and Oklahoma leave, do Texas Tech, TCU, Baylor, Kansas, Kansas State, Oklahoma State, Iowa State and West Virginia scatter to other conferences or stay together and rebuild?
Realignment is survival of the fittest. Collegiality and collaboration last right up until one party finds a better deal for itself than the collective can provide. There are a few factors that might work in the Big 12′s favor. Currently, the Big 12 is one of five autonomy conferences in NCAA Division I governance along with the SEC, Big Ten, Pac-12 and Atlantic Coast Conference. That doesn’t go away if Texas and Oklahoma leave. The Big 12 also has status within the current CFP structure. The Big 12′s share of CFP revenue is $67 million per season, same as the other Power Five (or Autonomy Five) conferences. Throw on top of that the Big 12′s deal with the Sugar Bowl, which pays another $80 million per year to the conference and puts its champion (or another highly rated team) in a high-profile game to face an SEC team. Those agreements expire after the 2025 season, but for five more football seasons, the Big 12 has big money flowing in through the CFP and its current TV agreements with Fox and ESPN. Plus, a possible windfall in exit fees from Texas and Oklahoma.

A new Big 12 might be stripped of all this status and earning potential eventually, but tapping into that for even five years should be appealing to a lot of schools that currently have neither."

BYU & any of the current AAC or MWC teams would be crazy not to jump on that revenue train, even if its just for a few years. And worst case scenario you are in a non-autonomous "best of the rest" B12 in 2025. Best case scenario, a few of the programs really blossom with the increased revenue and P5 label, and the B12 is viewed as a worthy power conference despite the changes, even if they are 4th or 5th in the pecking order. And that still gets you $20M+/yr per team in TV revenue, something none of those schools will even approach in their current conferences. It is because of this that if BYU, Boise, UCF, Cincinnati, Memphis, Houston, etc. get a B12 invite, they will jump at that opportunity.