I honestly don't think the research level, academic standards, AAU status, etc are going to matter much, if at all, when the college football landscape changes this drastically to these super conferences... Especially if you subscribe to the idea that the super conferences will eventually move away from the NCAA altogether.
Who do you think is running the Pac-12? It's the presidents and chancellors. That's who Larry Scott reports to. ADs barely have a voice. For them, it's about research affiliations. No interest in expanding conference affiliations if it doesn't drive research money & prestige. They'd pick New Mexico over BYU if forced to a choice.