I know its unimaginable to think a well oil machine like the SEC would split. However something better could be built and maybe the that alone could send a few schools off for secret talks.
Maybe they form something like this...

Texs
Oklahoma
LSU
Texas A&M
Arkansas
Tenn.
Florida
Georgia
Kentucky
Alabama

And 2 additional schools
maybe
Texas Tech
Mississippi
Florida st
Miami
OSU
Auburn
Mississppi st

Conference 1 -
West - Texas, Texas A&M, Oklahoma, Oklahoma State, Arkansas, LSU
East - Alabama, Mississippi, Missippi State, Kentucky, Georgia Tech, Florida State

Conference 2 -
South - Auburn, Georgia, Florida, Miami (FL), South Carolina, Clemson
North - Tennessee, Vanderbilt, Louisville, West Virginia, North Carolina, Duke

The ACC, down to six schools, takes out the remainder of Big East football:

South - South Florida, North Carolina State, Wake Forest, Virginia, Virginia Tech, Maryland
North - Cincinnati, Pittsburgh, Syracuse, Rutgers, Connecticut, Boston College

The Big 12 adds three from the Mountain West and 1 from Conference USA:

North - Colorado, Colorado State, Utah, BYU, Nebraska, Iowa State
South - Kansas, Kansas State, Missouri, Texas Tech, Baylor, Houston

The Mountain West, down to six, taps three new members:

Boise State, UTEP, New Mexico, TCU, SMU, Wyoming, Air Force, San Diego State, UNLV

Conference USA elects not to expand beyond the remaining nine members:

Rice, Tulsa, Tulane, Memphis, Southern Mississippi, UAB, Central Florida, East Carolina, Marshall

It's doubtful that you'd see the conferences break along geographic lines. There's no way Alabama wouldn't want to pair up with Auburn, Georgia, Florida and UNC if they could. Look for the strong schools to pair with the strong schools, not the closest schools.

This thread should be moved to dream conferences