This is a post from another MB. Pure fantasy, but an interesting idea.
I think the big ten should be no more. I would add 3 teams and create the Power 14 Conference.
Adding three instead of one would be a major addition. Each team would play the 6 teams from their division. They would be allowed to play 4 nonconference games. And then 2 games on a home-home rotational basis from the other division.