IF the SEC/Big Ten do go to 24, then I believe the FBS looks like this in 2032 (i didn't worry about divisions at this time)
SEC
Tennessee, Vanderbilt, Alabama, Auburn, Georgia, Florida, LSU, Ole Miss, Mississippi St, Kentucky, Arkansas, South Carolina
Missouri, Texas, Texas A&M, Oklahoma, North Carolina, NC State, Virginia, Virginia Tech, Clemson, Georgia Tech, Kansas, Duke
Big Ten
Michigan, Michigan St, Ohio St, Penn St, Iowa, Nebraska, Minnesota, Wisconsin, Illinois, Northwestern, Indiana, Purdue
USC, UCLA, Oregon, Washington, Notre Dame, Rutgers, Maryland, Florida State, Miami, Stanford, Colorado, Utah
ACC/BigXII (new conference)
Arizona, Arizona State, West Virginia, Iowa State, Kansas, Kansas State, Oklahoma State, UCF, Cincinnati, BYU, California, Connecticut
Texas Tech, Baylor, TCU, Houston, SMU, Pittsburgh, Louisville, Boston College, Syracuse, USF, Tulane, Memphis
Pac-12
Washington St, Oregon St, Fresno St, Colorado St, San Diego St, Boise St, Texas St, Utah State
Air Force, UNLV, Nevada, Wyoming, New Mexico, San Jose St, Hawaii, UTEP
Sun Belt
South Alabama, Troy, Arkansas St, Georgia St, Ga Southern, Louisiana, La-Monroe, Louisiana Tech, Wake Forest, UTSA, Florida Atlantic, Tarleton St
Appalachian St, Coastal Carolina, James Madison, Old Dominion, Southern Miss, Marshall, Charlotte, East Carolina, UAB, Rice, Tulsa, North Texas
MAC
Ball St, Bowling Green, Miami OH, Ohio, Toledo, Akron, Kent St, Buffalo, Massachusetts, Western Michigan, Eastern Michigan, Central Michigan
Northern Illinois, Army, Navy, Delaware, Missouri State, Western Kentucky, MTSU, North Dakota, North Dakota St, South Dakota, South Dakota St, Temple
CUSA
New Mexico St, Sacramento St, Jacksonville St, Sam Houston St, Florida International, Kennesaw St, Liberty, Stephen F. Austin, Idaho, Idaho State
Jackson St, Austin Peay, West Georgia, North Alabama, Central Arkansas, Abilene Christian, Eastern Kentucky, Montana, Montana St, Cal Poly