I figure the SEC, B1G, and Big12 all end up at 20 teams.
Now that seems bloated and crazy and gross, but I think there's a decent postseason that can come from that.
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3 super conferences can yield 6 teams, the top 2 of which would get a playoff bye.
Each conference has 2 ten-team divisions, in which everyone plays everyone. 3 OOC games, or if we wanted, 3 interdivisional games, keeping each super conference isolated. I think this would be a neat dynamic, as MLB was divided for so long, but is not necessary for this idea to work.
Anyway, that'd be 6 division champions. The polls could still be involved, determining the top 2 teams in the country getting a bye.
The other 4 division-winners play in the playoff.
This is not something I've ever advocated before, as teams were not on equal footing. But given this hypothetical, they all would be, and thus, a champs-only playoff makes sense.