If we go to 16 teams, we are looking at 4 divisions with 4 teams in each!
I'm trying to wrap my head around how this would work. It would be great for basketball, though. So in football, would you create essentially a "Conference Semifinals" where the winners of the 4 divisions meet and are seeded based on record, head-to-head, etc.? Then the next week you'd have the CCG? It could work, but it would require some tricky scheduling.
You'd schedule 12 games like you do now, but the 12th game is labeled as TBA. Half the teams are given home games, and half the teams are on the road. The 4 teams that win their division would play each other, and the other 12 would be matched up based on home/road setups and no rematches. This is way too radical for FBS football, but it does work in the lower divisions that have large conferences and there isn't a built in date into the schedule for CCG's.