There are conference championships, then a week off, then finals week, and then the team has about a week and a half of practice before the major bowl games/playoff games with a major holiday in the middle. Do you want bowl games going on the week after conference championship games? These teams need time to prepare it's not like they can just have finals and fly and play a game.
1.) Teams playing conference championship games are not playing in bowls that would constitute them having to play the next week.
2.) Why do you need more than a week to prepare for a bowl game? You don't get an extra week to prepare for your conference championship.