I'd probably go with 12 teams then
Western Division has
Boise
BYU
UNLV (terrible team, but big market, large student body, great new facilities)
SDSU
Houston
SMU
You've got Boise as a top team, BYU and Houston as near-peers and SDSU and SMU that occasionally rise to the top. And huge markets with Dallas, San Diego, Houston and Las Vegas. Plus natural rivals Boise/BYU, SDSU/UNLV, Houston/SMU
Eastern Division has
UCF
USF
Memphis
Cincy
...and two more, maybe Army/Navy? App State/Marshall? Tulane/Louisiana?
Again you have a combination of strong top teams (UCF, Cincy, Memphis), spoiler teams (App State, USF, Marshall), big markets (Orlando, Tampa, Cincy, New Orleans) and natural rivalries (UCF/USF, Memphis/Cincy, and whatever 3rd pairing)
But to make it all happen would be a logistical nightmare.