I think they've got some work to do before they move to an 8 team playoff. Namely TV slotting and game sites. The Orange bowl capacity is 76K, the game box attendance was 67K and that seemed about right. Nearly all sections were full, but most had a bunch of spare seats littered throughout. I'm not sure about the Bama game. You can't ask fans to travel to 3 straight "bowl" games and expect good crowds. The ratings were down, and I would think you'd want a few years of New Years Eve v New Years Day ratings to analyze before you expanded the field to 8.
Every year there are bowl blow outs among top teams. There is questionable motivation, focus, etc regarding these kids, especially those thinking of turning pro. They're not playing for anything and have checked out by the time the bowl game arrives. Ohio State checked out all year after winning it last year, so I don't think you can point to a good bowl performance and assume they were a better choice than MSU or OU. Stanford lost to two teams who lost another 6 games. They needed a big game in September, not on New Years Day. Best two teams are playing for the title and the committee isn't going to fix what isn't broken, especially with unfilled stadiums and ratings issues.
But if they do got to 8, I expect the first round games to be at the home stadiums of the top 4 teams.