The future of the College Football Playoff may come down to one major question. How big is too big? College football already transformed the postseason by expanding from four teams to 12, a move designed to increase access while still protecting the importance of the regular season. But before the new format has even had time to fully settle, momentum is already building toward another expansion. The problem is that there is no agreement on what that expansion should look like. The SEC has reportedly pushed for a 16-team format, while other conferences, including voices connected to the Big Ten, have shown interest in eventually growing the field to 24 teams. That disagreement is creating real tension behind the scenes and could completely stall future changes. Indiana Head Coach Curt Cignetti smiles as he is interviewed on the podium after the College Football Playoff National Championship.…