I could envision a real possibility of two conferences moving to 16, but not all, and not the ones most people would think. I could see the SEC and B1G standing pat. They clearly don't need to do anything - they are in the catbird seat already.

I could see the following happening as the PAC and B12 GoRs are near their end:

I believe the B12 would cede West Virginia in a heartbeat, and without penalty, to the ACC if they would take them. The ACC could then shoot for Navy as a football only add, bringing them to 16 for all sports. They largely divide into Old Big East and Old ACC divisions.

Left with 9 members, the B12 is then free to add the 4 Cali schools, the 2 Arizona schools and Colorado, bringing them to 16. Texas Tech joins the new adds in a western division.

The badly depleted PAC then adds Boise State, BYU, Nevada and San Diego State to get back to 9 for football, and then adds Gonzaga for all other sports. That gives them a geographically logical conference, with P5 strength in football and excellent basketball. They would have a balanced 4/4 football schedule and an 18 game double round robin in hoops.

The new PAC is strong enough to continue to warrant a guaranteed berth in the NY6, and with the best western schools now out of the G5 picture, the AAC is almost assured of the guaranteed G5 slot in the NY6 in most years.