As someone who has played in two bowl games, I can tell you that I don't see the current system changing much. The reason is money. When a team plays in a bowl game, they travel to the bowl city 4 or 5 days before the game. This is unlike a normal road game where the team travels to the game the day before. During these days leading up to the game, it is non-stop luncheons and banquets with the players, alumni, sponsors, politicians, etc. The bowl sponsors pay big money so that they can have these events to entertain their clients, bankers, executives, major stock holders, etc. Essentially the whole week is a huge marketing tool for the sponsors. There is only a couple of hours a day available to actually practice and prepare for playing the game, which brings up the other point, the time factor.
Since there is very little time for game prep during bowl week, the team must get their game prep done before Christmas. So essentially the schedule is finish the season the first week of December, take a week for final exams, practice a week, take a few days off during Christmas to visit your family, then travel to the bowl game. I can't really see where you can fit more games in December. The way that the alumni and sponsors use the bowls as a marketing tool, I can't see where they are going pay big money to sponsor a bowl and not get the benefit of holding all of the bowl events which include the players. This is unlike the other college playoffs where the players stay home during the week, practice, then travel to the game the day before the game.
The only way a playoff system could work would be to play the conference championship games during Thanksgiving weekend, then play the first round of playoff games the first week of December (conf champ vs. conf champ)to determine the 4 BCS bowl teams, then play the bowl games, then play an additional game the second week of January between the 4 bowl winners, and finally a championship game the third week of January. This would give the bowl sponsors their bowl week that they pay big money for, but it would make for a long season. I think that the coaches and school administrators would be against it because it would cut short the recruiting season and not give the players more than a few days for the Christmas holidays.