only reason this won't happen is because it puts the SEC, Big, and Pac on same footing as Sun Belt, AAC, and WAC.
no way these power conferences give a perceived lessor conference that equal access.
I understand what your saying, but those 5 at-large spots would come from Pac-12, SEC, B1G, ND for the most part anyway. Giving the smaller conference teams a slot shuts down any anti-trust challenges if college football wanted to expand its playoff system.
Also to other points made, any site without weather problems Georgia Dome, Super Dome, JerryWorld, Rose Bowl could host double-headers easily. Have a 1pm game and then 8pm game. Obviously you couldn't have 4 games at one site like the NCAA tournament. Also, the size of your football field would have no bearing on the playoffs. If your 12-0 and earn the 8 seed you get whomever the committee deemed your opponent would be. Thus, if Northern Illinois was deemed a top 8 seed last year which is doubtful, but possible they would host their first round game. The TV generated from being able to broadcast these games would be sufficient that stadium capacity wouldn't matter. They could disburse the revenue in credits a la the basketball tournament and thus giving each conference atleast 1 credit to divide which would be better than the current system, and the top conferences would earn their additional credits by how their teams performed.
Here is how I would have done it under what I suggested based on last year season.
3rd week in December
1. Notre Dame(at-large) vs. 16. Wisconsin(B1G) (following the LAX model of reducing travel)
2. Alabama(SEC) vs. 15. Arkansas State(Sun Belt)
3. Florida(at-large) vs. 14. Northern Illinois(MAC)
4. Oregon(at-large) vs. 13. Utah State(WAC)
5. Georgia(at-large) vs. 12. Louisville(AAC)
6. Stanford(Pac-12) vs. 11. Boise State(MWC)
7. Texas A&M(at-large) vs. 10. Tulsa(CUSA)
8. Kansas State(Big XII) vs. 9. Florida State(ACC)
Remember in lacrosse geography matters I would flip Tulsa and Louisville if A&M-Tulsa and Georgia-Louisville didn't make better geographic sense.
New Year's week
The quarterfinals
Rose Bowl(Pasadena)- hosts ND-Wisconsin winner vs. K State-FSU winner, Oregon-Utah State winner vs. Georgia-Louisville winner
Orange Bowl(Miami)- Alabama-Arkansas State winner vs. A&M-Tulsa winner, Florida-NIU winner vs. Stanford-Boise winner
2nd week in January
Sugar Bowl(New Orleans)- doubleheader featuring 4 winners
4th week in January week between NFL Conference Championships and Superbowl
Chick-Fil-A Bowl(Atlanta)- National Championship game