Another plausible(-ish?) future superconference scenario! This results from the P5 maintaining the status quo through the expiration of the current Big 12 GOR and up to the expiration of the current ACC GOR. As has often been presented, the Big Ten, SEC, and Pac cannibalize the poor ACC and Big 12. Here each of the P3 conferences reaches 18 schools, with 3 divisions of 6. A fourth 18-school conference forms from the ashes of the ACC and Big 12, along with the cream of the G5 crop.

For each 18-team conference: In basketball, there are 22 conference games (2 x 5 division + 1 x 12 other schools). In football, there are 9 conference games (5 division + 2 vs. each of other 2 divisions), allowing for a full conference playthrough in 3 years. A 2-round conference playoff is held between the division champs and a wild card. The CFP accepts the champs of the P3 conferences and a wild card.

Big Ten
East: Duke, Maryland, North Carolina, Penn State, Rutgers, Virginia
Central: Indiana, Michigan, Michigan State, Notre Dame, Ohio State, Purdue
West: Illinois, Iowa, Minnesota, Nebraska, Northwestern, Wisconsin

Pac-18
East: Kansas, Oklahoma, Oklahoma State, TCU, Texas, Texas Tech
Central: Arizona, Arizona State, Colorado, UCLA, USC, Utah
West: California, Oregon, Oregon State, Stanford, Washington, Washington State

SEC
East: Clemson, Florida, Florida State, Georgia, NC State, South Carolina
Central: Alabama, Auburn, Kentucky, Tennessee, Vanderbilt, Virginia Tech
West: Arkansas, LSU, Mississippi State, Missouri, Ole Miss, Texas A&M

Big 18
East: Boston College, Central Florida, Connecticut, Miami-FL, South Florida, Syracuse
Central: Cincinnati, Georgia Tech, Louisville, Pittsburgh, Wake Forest, West Virginia
West: Baylor, BYU, Houston, Iowa State, Kansas State, Memphis

Note: Based on the current strength of the teams, I admit that the Big Ten's divisions are not competitively balanced, but they preserve most of the important rivalries.