If there would be significant realignment, the only probable scenario would be reverting back to 10-team B10, SEC, ACC and PAC10 as follows:
B10: Minnesota, Wisconsin, Iowa, NW, Illinois, Purdue, IU, Michigan, Mich ST, Ohio ST
SEC: LSU, Ole Miss, Miss St, Auburn, Bama, UK, Tenn, Vandy, Florida, Georgia
ACC: UVa, Duke, UNC, WF, NCSt, Clemson, South Carolina, GTech, FSU, Miami FL
P10: Washington, Wash St, Oregon, Oregon St, Cal, Stanford, USC, UCLA, ASU, Arizona
Then you have the following fill in the gaps:
Big East: Boston College, UConn, Syracuse, Rutgers, VA Tech, Maryland, Pitt, Penn St, WVU, Louisville
Big 12: ISU, NU, KU, KSU, Mizzou, Arkansas, OU, OK ST, Texas, Texas A&M
MWC: BU, TCU, Houston, Texas Tech, New Mexico, Utah, BYU, Colorado, Colorado St, Boise ST
Notre Dame stays indy. G5 conferences stay as-is.
Each conference plays 9 game round robin.
8 team playoff. 7 auto qualifiers with conference champs plus one at-large from indies, conference runner-up or G5 team.
1st round playoff games replace CCGs with top 4 seeds hosting games the first weekend in December.
NY6 and other bowls remain as-is. CFB calendar stays as-is.
BTN picks up Big East. ESPN picks up B12N, PACN adds MWC.