You're right... specifically Colorado and Utah wanted no part of the expansion to 16.
When PAC was thinking about adding UT ,TT, OU, OSU, Scott needed 9 of 12 votes and 2 emphatic NOs were Colorado and Utah.
Those 2 schools enjoy being in a divison with SoCal (which they are in the PAC-12 South).
However, if the 4 Texas & Oklahoma schools came aboard, they PAC 16 was going to split into the old PAC-8 (Wash, Oregon, Cali)
and an eastern division of AU. ASU, Utah, CU, OU, OSU, TT, UT.
Colorado and Utah, would lose their recruiting in California, and be the little guys in this new division, so they urged Scott to kill it.
I think we're all looking at the Big 12 now, since they were able to save themselves from collapse, and look at the ACC movement, and right now, we're all looking to see if schools like FSU, Clemson, GA Tech and NC State would make the move make the Big 12 the Big 14.
And if the Big Ten were to take (2) ACC schools like Virginia and UNC, then sure, those schools could be in play even more.
But once the Big 12 grants waiver is up, it will still come down to money. And if the Big 12 schools of Texas, Texas Tech, Oklahoma and OSU see more money in joining the Pac-12, then sure, it could happen. There are issues at stake beyond the timeline of waiting out the grants waiver, like the LHN, academics, etc.
But it comes down to one point: anything can still happen at this point in the Big 12. They could get stronger with ACC additions, they could add Big East schools, they could remain at 10, they could add MWC schools, and in the future, they could still lose schools to conferences like the Pac-12, Big Ten or SEC.