This is an important point. There are likely going to be additions that do not help from a per team revenue perspective, but lock up regions in the Big 12 that can help secure playoff access down the road. Nothing is guaranteed, but if you had all of AZ, CO, Utah, KS in the Big 12, that would help.
My only concern is if the Big 12 gets too picky and focuses on scratching out an extra couple mil per team, could it leave enough of an opening for the BIG and SEC to grab say U of A, Utah, Stanford, Oregon and Washington now, and then figure out a way to get the ACC dissolved and snatch the best few out of that league. Then they might figure they are at a good enough number and geographical reach between the two to have a 40-48 team breakaway league with some B12 poaching.
I like the idea of trying to lock up reasonable deals with the both AZ schools, Utah and CO for that reason.