I fully expect some PAC 12 schools to at least threaten to move to the Big 12 when their TV deal is coming up to expire in 2023.

This is how I see it, the ESPN/Fox deal expires in the PAC-12 in 2023:

http://www.businessinsider.com/pac-12-new-tv-deal-2011-5

Right now the Big 12 is outpacing the PAC 12 in funding. Significantly if you include Tier 3 rights.

http://www.mercurynews.com/2017/06/20/pac-12/

The Big 12 grant of rights expiration is 2025, i.e. after the PAC 12 deal.

http://www.cbssports.com/college-football/news/big-12-expansion-losing-momentum-no-grant-of-rights-extension-ranking-candidates/

So, why wouldn't a USC, who clearly could command a healthy Tier 3 package in the Big 12 model, at least look at the possibility of moving to the Big 12? The Big 12 would obviously be interested in bringing a named school like USC on board. And if it is really all about the Benjamins, why not?