Seriously though BYU has stronger credentials than half the P5 schools. Top 25 football and top 15 basketball attendance. Strong Olympic sports, strong academics and so forth. BYU is turn key ready. Luckily for the Big12 the only conferences geographically for BYU is them and the PAC. And we know what the PAC schools think about religion.
The Big 12 is just a clown show right now complacent that BYU will still be there tomorrow for the taking. If the PAC was rumored to take BYU and CSU next week I guarantee the Big 12 would snatch them up in a hurry.