Actually 4 x 20 with 5 divisions of 4 might be better. The more divisions you have the more wide spread interest. The SEC has so many quality teams that it pushes some brands down a notch. That doesn't happen if you have more divisions.
B1G
North- Wisconsin, Minnesota, Northwestern, Illinois
South- GA Tech, UNC, UVA, Duke
East- Ohio State, Penn State, Maryland, Rutgers
West- Nebraska, Iowa, Colorado, Kansas
Central- Michigan, Michigan State, Purdue, Indiana
For years, Wisconsin has been propped up by the B12 West. This would prop up GA Tech, Nebraska, and Michigan all brands that have been down after expansion.
SEC
North- Tennessee, Kentucky, Virginia Tech, Vanderbilt
South- Alabama, Auburn, Ole Miss, Mississippi State
East- Georgia, Florida, NC State, South Carolina
West- Oklahoma, Texas A&M, Texas, Oklahoma State
Central- LSU, Arkansas, Missouri, Kansas State
This would prop up Tennessee.
ACC
North- Notre Dame, BC, Army, Navy
South- FSU, Miami, UCF, USF
East- Pitt, Syracuse, Temple, UConn
West- Cincinnati, West Virginia, Louisville, Memphis
Central- Clemson, Wake Forest, East Carolina, James Madison
This would prop up Northeast football.
P12
North- Oregon, Washington, Washington State, Oregon State
South- Arizona State, Arizona, San Diego State, UNLV
East- Houston, Texas Tech, UT San Antonio, New Mexico
West- USC, UCLA, Stanford, Cal
Central- Utah, Boise State, Fresno State, Air Force
You are propping up ASU and your entry into Texas making the entry worth more.
The states of Wyoming and Hawaii get left out.
For SU we would play Pitt, Temple, UConn, BC, FSU, Cincinnati, Wake Forest every year. The other teams we would play once every three years. So home and away over 6 years. BBall would stink. We would be trading Duke, UNC, UVA, GA Tech, NC State, VA Tech for UConn, WV, Cincy, Memphis, Temple, ECU, UCF, USF, JMU.