Best case scenario for 24 teams:
Week 1 (Dec 5) replaces Conf Champ week with teams 9-24 playing on campus games. At least these games will matter, unlike the current conf championships. This will be ripe for upsets too as that group will be more evenly matched.
Week 2 one week later (Dec 12): week 1 winners against top 8 on the campuses of the top 8
Quarterfinals week 3 (week before Christmas Dec 19): reseed the week 2 winners, play at neutral sites (big bowl game sites)
Semis on New Year's Day: Always Rose Bowl and alternate Sugar/Orange bowls (best for partying and tradition)
Finals Neutral site the next Saturday (Jan 9) since the NFL playoffs don't start until the following week.
One can dream.