Big10 will hold at 18 until we figure out if the ACC is going to collapse. If that's the case, then you'll probably see the SEC go ahead and take Clemson and FSU.
Expecting the Big12 to add Arizona, Arizona State and Utah to go with Colorado. If a total collapse happens and those three go to 20 teams, then I'll expect the Big10 to add Syracuse and one of Pitt/Virginia/Louisville.
SEC probably adds Miami and VTech.
Could see the Big12 then adding Washington State, Oregon State, GTech and Louisville (if UL doesn't go to the Big10.).
I think the ACC would have to grab teams to stay relevant and add Liberty, LaTech, JSU, and maybe even WKU.
PAC-? Adds schools for markets and grabs Hawaii, Boise State, Utah State, Nevada, UNLV, New Mexico, NMSU, SMU, CSU, Air Force, Wyoming, to go along with Cal, Stanford, SDSU, San Jose, and Fresno.