The B1G and SEC did the math, as should you. More conference games works against the big name schools. Bama fought hard for four OOC games as the SEC needs everyone to win their four games so the conference looks better.
Wins and losses in conference play will always equal each other. For each win the SEC champ possesses, another SEC team must have a loss. Assuming eight teams can run the table, the remaining eight will have zero conference wins. Assume every SEC team wins their respective OOC games, the SEC would have eight teams with 12 wins and eight with four wins. Obviously, this schedule would be a joke and is virtually impossible. However, if you evenly distribute the wins, you get the picture. The picture gets worse with none or 10 conference games. Again, this assumes each SEC teams wins every OOC game. The numbers are worse if the don't, and they won't.
Now pick which big names will be happy being relegated to mediocrity or worse. Fans will not follow a mediocre team in the same numbers as perpetual contenders.
Repeat for the B1G.
You are not following the math at all. The bigger the conference goes the less the big name teams have to play. Is Bama not better off playing Texas once in four year vs every other year?
Edit
This would be a typical Bama 4 year stretch:
Year 1: LSU, Florida, Tennessee, Auburn, BYU, Kentucky, NC State, Mizzou, Vandy, Houston, UAB, Tulsa
Year 2: LSU, Texas, Tennessee, Auburn, Arkansas, Kentucky, VA Tech, Colorado, Vandy, Houston, Jacksonville State, LA Tech
Year 3: UGA, A&M, Tennessee, Auburn, Clemson, Kentucky, Ole Miss, Kansas, Vandy, Memphis, Middle Tennessee, Western Kentucky
Year 4: Oklahoma, FSU, Tennessee, Auburn, South Carolina, Kentucky, Miss State, Vandy, Memphis, Arkansas State, Troy
This would be a typical Ohio State 4 year stretch:
Year 1: Michigan, Penn State, Notre Dame, Iowa, GA Tech, Purdue, Illinois, Stanford, Indiana, Duke, Toledo, Marshall
Year 2: Michigan, Penn State, USC, Mich State, Purdue, Minn, Pitt, UNC, Indiana, Duke, Bowling Green, ODU
Year 3: Michigan, Penn State, Nebraska, Washington, Purdue, UVA, Maryland, Illinois, Indiana, USF, Akron, Southern Miss
Year 4: Michigan, Penn State, Wisconsin, Miami, UCLA, Purdue, Northwestern, Rutgers, Indiana, Kent State, James Madison
Both teams are easily getting 10 Ws and making the playoffs vs those schedules. And it is actually easier than the current schedules they play. Although I made the assumption that FCS games will eventually go away. That might not be the case. Also I made the assumption that both the B16 and SEC will require 10 power games total. If it is only 9 then you can replace those OOC ACC/B12/P10 games with G5s or FCSs.