The new Big XII: WVU, Iowa State, Kansas State, Kansas, Texas Tech, Baylor, TCU, Oklahoma State [and then maybe] Cincinnati, UCF, Houston and BYU.
When I look at that list, I see two schools with national championships in football; one of those happened in 1984, and the other was self-awarded. Both come from schools who would [possibly] be entering the conference from G5.
The oft-mentioned criticism of the ACC and PAC-12 by Big XII fans bears an irony I can't get over. I've frequently heard locals postulate about how "if USC and Oregon left the PAC-12" or "if Clemson and Florida State left the ACC" they wouldn't be P5 anymore. Well, I got some bad news, those theories remain theories, while it just literally happened to the Big XII.
More bad news: Texas and Oklahoma account for approximately 50% of the current Big XII TV contract.
My source? Bob Bowlsby, Commissioner of the Big XII Conference, the last human being on Earth that would want to admit that publicly, admitting it publicly.
I can provide a link if you need it but Google is right up there in the corner of your browser.