There were discussions when the Big 12 looked doomed to implode last time that the ACC would go to 20 teams with 4 pods of 5 teams and that those pods would rotate who they played each year. Rumors where also that the ACC would be open to taking on Navy to help Notre Dame with their scheduling. Lots of talk back then but I wouldnt be surprised to see it start again. The pac 10 wants OK and OKst and has the money to pull them and Texas would probably not view the SEC as a viable landing spot.
I like the two team pod system I designed better than a four team system. It creates mini leagues that play each other enough that you can keep real rivalries. I set it up so that most of the teams are regional (excluding Miami which has more northern alumni than local Floridians) and they'll play 5 regional games but have one traditional (or great for tv if not traditional) non-region rival. Then the other 2 or 3 games will be rotated through the other pods.
My two team pod system works like this. Each team is placed in a small two team pod system. Each team plays the pod above and below it plus their pod mate and one designated "rival". In my hypothetical 20 team, 2 pod Super ACC it would look like this. The non regional rival is across with an arrow from the team.
Pod 1 (plays Pod 2 and Pod 10)
FSU ----plays rival----> Louisville
Virginia --------->UNC
Pod 2 (plays Pod 1 and 3)
Georgia Tech --------->Texas Tech
Clemson--------->Oklahoma State
Pod 3 (plays Pod 2 and 4)
North Carolina--------->Virginia
Duke--------->Syracuse
Pod 4
Wake Forest---------> ND buddy
NC State--------->Virginia Tech
Pod 5
Oklahoma State--------->Clemson
Texas Tech---------> Georgia Tech
Pod 6
Texas--------->Notre Dame
Oklahoma--------->Miami
Pod 7
Louisville---------> FSU
Pittsburgh---------> Boston College
Pod 8
Syracuse--------->Duke
UConn/Navy/Cincy/West Virginia --------->Wake Forest
Pod 9
Notre Dame--------->Texas
Boston College---------> Pitt
Pod 10 (Plays Pod 9 and 1)
Miami --------->Oklahoma
Virginia Tech--------->NC State
So that would mean under my setup that every year Notre Dame would play Texas, Boston College, Syracuse, Miami, Virginia Tech and Uconn/Navy plus two or three random. Frankly I really like the idea of playing three random for a 9 game conference schedule. ND could still schedule USC and Navy (if that's not your buddy) and yet have a fully national schedule with just the new ACC.
I've been careful to keep all of the rivalries. For example UNC still plays its preferred Tobacco Road schedule (UVA, NC State, Wake, Duke, Clemson and GT) while FSU actually plays its preferred southern football school schedule (Miami, Clemson, GT, Virginia Tech, Louisville and Virginia (which used to be good and could be again but really just because it works opposite its current rivals Miami and VT). Texas keeps a mainly SWC schedule with one big marquee game outside as it would play Oklahoma, OSU, TT, Notre Dame, Louisville and Pitt). Oklahoma similarly plays SWC plus one big TV game in Texas, OSU, TT, Miami, Louisville and Pitt. Miami gets to play four marquee games in FSU, Oklahoma, Notre Dame and Virginia Tech plus schools which should give them a margin of error and still have a good record and fits their northern alumni demo in Boston College and UVA.