Practicalities of CFP Size
Four works. Two games on New Year's Day or Eve and the CFP.one of those sites a week later. The existing bowls - a long-term cash cow for the colleges - are happy.
Eight means four games on or about Christmas, hosted by some of the lesser bowls (I don't see Rose, Sugar or Orange changing to Christmas). These dates are inconvenient to the fans and the players. Then the semis are at New Year's. But what happens to the major bowls left out. The Rose won't change from New Year's, but in off-years would have pretty slim pickings if the best eight are already gone.
Sage Grouse
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'When I got on the bus for my first road game at Duke, I saw that every player was carrying textbooks or laptops. I coached in the SEC for 25 years, and I had never seen that before, not even once.' - David Cutcliffe to Duke alumni in Washington, DC, June 2013