Yep.....8 teams is inevitable. It just makes too much sense for it not to happen.
You take the 5 conference winners. That leaves you 3 at large, and it the committee decides to let in a Marshall/Boise/ECU type team, then so be it.
You play the first round of four games on the higher seeds homefield, so as to cut down on travel expenses for fans. From there, you do it just like it's set up now. I wouldn't even have a problem going back to an 11 game schedule, if the school President's think that's too many football guys as it is. I mean, it could conceivably be 16 games for two teams. 12 regular season, a conf championship, and 3 playoff games if you get to the finals. That's ALOT of football for collegiate kids. Right now it would look something like this if it ended today:
Ohio State @ MS State vs TCU @ Alabama
AZ State @ FSU vs Baylor @ Oregon
Play all four games on a Saturday, starting at 12ET. You could have some slight overrun, but start them every two and a half hours for TV purposes. 12, 230, 5, 730.