Just getting caught up on all this. One thing that I really think people are missing is the geographic diversity is actually by design. I actually think the Big Ten will end up grabbing at least two more West Coast teams, because they're actually using the geographic diversity to strengthen their TV offers.
Multiple teams on the West coast allows the Big Ten to put together packages that will allow networks to show football from 11:00 AM to 12:30 AM on Saturdays. With the West coast teams, they're essentially entering an entirely new game window that they can sell. If the Big Ten gets creative, they can also sell double-header TV packages on Thursday and Friday nights. They would simply start a game on the East coast at 7:00 local time and follow it with a game that starts at 7:00 local time on the West coast. If the first game overruns, it really doesn't matter, because Thursday and Friday night are pretty lean, so ESPN/Fox/Amazon can simply put the game on another network/feed.
It may not be the best for fans of those teams, but could mean big, big money on their next TV deal.