Just think of divisions as the new conference. Expanded playoffs will allow it. Conference semifinals are added. With this level of realignment it basically a P2 top tier. Going to 11 conference games isn't an issue imo, it brings back value to inter-conference post-season matchups. 5 games against your division every year, rotate through the other 3 divisions.
OU, UT, A&M, Arkansas, MU, KU
LSU, Ole Miss, MSU, Bama, Auburn, Vandy
UGa, UF, Tennessee, VT, USC, Kentucky
Clemson, FSU, UNC, Duke, UVa NC St
That and time changes people's perceptions. As a 24-30 team College Football League, why is it important teams play each other every 4-5 years? Do we care that NFL teams don't play each other frequently? Nope, just the division rivals.
Plus, not playing teams frequently works out better when there is an 8-12 team playoff. Fewer regular season rematches.