College football is potentially in the midst of more change. The College Football Playoff — fresh off only its second season with the expanded 12-team format — could expand once again, doubling the number of teams up to 24. In the new model, eight teams would receive a first-round bye, while teams seeded nine through 24 would compete in a 16-team, eight-game opening round. The Round of 24 and Round of 16 would each feature eight games, presumably to be held on campus. One thing worth noting is that a five-round College Football Playoff could place significant pressure on the calendar, potentially forcing changes to — or even eliminating — conference championship games, according to a report from Yahoo Sports' Ross Dellenger.…