It really would be easier just to merge what's left of the Pac 12 with the Big 12 and be done with it.
As of next year, the Big 12 will consist of Oklahoma State, Colorado, Iowa State, Baylor, Houston, BYU, Cincinnati, Central Florida, Kansas, Kansas State, Texas Tech, TCU, West Virginia, and most likely will add Arizona, Arizona State, and Utah. Just pull in the remaining 4 in the Pac 12 and end all.the suspense. But yes, returning to divisions is a must at this point, even without a merger