Here is my version of the 8 team playoff:
New Years day - Top 8 teams play (in my perfect scenario they would play in the bowl games of my childhood, Cotton, Orange, Sugar, and Rose)
This is followed by a 5-10 day break for the players before they start preparing for the semi finals, which will be held the day before the NFL championship games. So there would be semi-final Saturday for college followed by Championship Sunday for the NFL
College championship game will be held the following weekend, the bye week before the Super Bowl.
Never happen but if it did I would truly be footballed out and ready for a break from watching it.