Come up with an objective system that makes a playoff system fair to every Division 1-A school instead of 7 teams plus Notre Dame every year.
I already have. You use the BCS standing to rank the top conference champions in an eight-game playoff. NO wild cards. Notre Dame (and any other independant) is treated like a conference unto themselves.
In most years, that means ND would have to finish in the Top 15 to qualify so they would make it some years but not every year. I wouldn't complain if they made a "top 8" rule for independants like the BCS has now.
Here ya go, 5 years old and still applicable: