I say expand to 20 teams (yes 20), and split into four five-team divisions as follows:
WEST - Iowa, Kansas, Minnesota, Nebraska, Oklahoma
CENTRAL - Indiana, Illinois, Northwestern, Purdue, Wisconsin
NORTHEAST – Michigan, Michigan State, Ohio State, Penn State, Rutgers
SOUTHEAST – Duke, Maryland, North Carolina, Vanderbilt/Georgia Tech, Virginia
*New members are in bold.
Each year on a rotating basis, the divisions pair up to form two “super divisions.” For example, in Year 1 the West and Central divisions would pair up, as would the Northeast and Southeast divisions. Then in Year 2, it would be the West and Southeast in one super division and the Central and Northeast in the other. The ten teams in each super division play the other teams in their respective super division round-robin style, for a total of nine conference games. The winners of each super division play in the Big Ten Championship game. Voila!