It may be coincidence we have 64 schools in five power leagues and allowing Notre Dame independence. Regardless the current 64 schools could be organized if he conference continue to expand and stop with 16 members.
Each league could then have the four team pods with four schools in each pod. Each power league could then have semi final conference championship game matching the winner of the four pods with those semi winners advancing to the championship conference games that would provide the playoff committee another game to determine the best four teams that reach college football playoffs.
In order to made this happen some leagues will have to loss members and a couple leagues would have to merge.
The Pac 12 or Pac 16 is an easy solution if Texas and Oklahoma decide to abandon the Big 12 and take a couple in state schools.
Pac 16 pods:
Cal, UCLA, Stanford, USC
Oregon, Oregon State, Wash State, Washington
Arizona, Arizona State, Colorado, Utah
Texas, Texas Tech, Oklahoma, Oklahoma State
The Big Ten could continue expansion down the Atlantic Coast with a twist. Expand with Virginia and Virginia Tech to avoid politics.
Big Ten pods:
Nebraska, Iowa, Minnesota, Wisconsin
Illinois, NW, Indiana, Purdue
Michigan, Michigan State, Penn State, Rutgers,
Ohio State, Maryland, Virginia, Virginia Tech.
The SEC could then take North Carolina and Duke to complete its twist to reach 16.
Texas A&M, Arkansas, LSU, Missouri
Alabama, Auburn, Mississippi, Miss State
Florida, Georgia, Tennessee, Vanderbilt
South Carolina, North Carolina, Duke, Kentucky
The ACC and Big 12 would be left with 10 schools in one league and 6 in the other that could simple merger to create a Big 16? Since the old BCS days and the old Big East, only one power schools has been left out in the cold. Temple which was actually boated from the league not currently member of a power league.
New Big 16 with a merged Big 12 and ACC
Kansas, Kansas State, Baylor, TCU
Louisville, Iowa State, Pitt, WVU
Syracuse, Boston College, Florida State, Miami
North Carolina State, Wake Forest, Clemson, Georgia Tech
With this new type of alignment, the power leagues would continue to have their semi final and conference championship games and scheduling would be very much more easy to maintain rivalries in today's geographical challenge leagues.
Each four team pod would play round robin of three games and the other games that count could come from another league pod member of an entirely different power league pod game could count in the standings. For example and Florida State and University of Florida game could count in standings for both the new merged Big 12/ACC and SEC standings.
The four team college football playoff would have more games in the conference championship semi final and finals to aid in determining the best four teams to play for college football championship.