They just cancel it or let the pimp in. Better yet, you just let Oregon and Osu into the sec championship and make it for 12 teams and cancel the national championship. Theres only two conferences that are really in the top level anyway. The big 12 and acc arent even close to major conferences and couldnt make one if you combined to rest of all leftovers. Now watch BYU win it all.
If the above scenario happens, then the Eenie Meenie Miny Moe selection process will be on steroids or maybe LSD.
Winning the SEC game remains a high priority, because if you lose it, you've got an extra game in the CFP to play. In that sense it is sort of a curse, because a team like Ole Miss can sit back, pick up that extra week of rest by not playing in the SECCG and not have to stress over winning or losing it before beginning the actual CFP.