I wonder if at least part of the analysis for the Big Ten (and Alliance confs) goes like this:
we get [insert some relatively high percentage, like 90%] of the benefit of playoff expansion that we're going to get, by going to 8. And that eliminates the issues with another round in the bracket (where to play, when to play).
Going to 12 only stands to mostly help the SEC, as those additional 4 are just likely to be SEC at-large teams.
They could do the 6 highest ranked conf champs, which usually will be defacto P5 auto's plus the best G5, perhaps occasionally 4 and 2, and then 2 at-large. The G5 wants this badly. They are 5 of 11 votes.
How many teams in the country, who don't win their conference, are realistic possibilities to win the natty, in a given year? 2 seems reasonable.
The thing is just that, the SEC literally can't afford to do that. They're going to have 16 mouths to feed, and as some guy listed at least 9 of them think very highly of themselves in football. They badly need it to be 6 at-large bids. They might walk away ...