I agree with the WLA post on money keeping the BCS in place, but don't think a viable alternative would really be that hard to figure out. In an 8 team playoff, there would be 7 games, 4 quarterfinals, 2 semi's, and a championship game. with 6 major conferences and a whole bunch of schools we can group as "other" it gives us a total of 7 different groups we must appease.
Now, when you start the playoff, you start a rotation of games. You have games 1-7 numbered and drawn out of a hat, with 1 being the title, 2-3 being the sems, and 4-7 being the quarters. Each conference, including other, gets to choose a site among its schools to host their game at this year. The tv rights for that game would be sold to that conference and they would then sell them to a network. By doing this the conference can rake in ad revenue and ticket sales from each game. Obviously games would try to be matched regionally in the quarters so as to increase draw.
Each year the conferences rotate, going up one number, or, if they are number 7, going down to 1. This is necessary because obviously some games will make more money than others. You also would keep the current non bcs bowl structure for teams that do not make it into the playoff system, yet still get 6 wins, as sort of a huge nit.