Obviously, as there is no Big East football conference. My dream has always been to have a conference of the top NE football programs, (several of whom are pretty good at basketball, too) and another conference of the best basketball schools. In the wake of being 'left behind' in a super-conference 'rapture', maybe we can do something like that.
In BBall you need an 11 team league. That gives you inventory (110 league games) and allows for a round robin. But how do you get to 11 from the left behinds? The 9 OG Big East teams should all be chosen, but then who? You still need 2 more schools.
Maybe Notre Dame (almost like a NE) if they stay Indy in FB. Maybe Duke (almost like a NE) if they get left behind.
Looking at old Big East schools
Does Miami (almost like a NE) get left behind? Are they too far away? West Virginia doesn't fit the other 9 schools but they have a history. Would they leave the B12? Same with Louisville and Cincinnati but they are less NE compared to WV. Plus I think both prefer the B12. VA Tech isn't good enough and is in the middle of nowhere. They likely don't get left behind anyway. USF no way.
Looking at current Big East schools
No way to DePaul, Butler, or Creighton. Marquette is good but too far away. Xavier I suppose is the best choice but isn't a good choice.
Non Big East schools
Temple adds another mouth in a market you are already in. Same for UMass. VCU is probably the best choice from the non Big East schools.
I would say ND and Duke would be the first choices. If they aren't available then WV and VCU. If WV doesn't come along then who? I think you would have to stay at 10 in that case.
For FB you need 10 teams. That gives you 45 games and allows for playing everyone in conference. I think SU, Pitt, UConn, BC makes sense. Where do you go from there? You need SIX more teams.
Old Big East
Temple fits but do you invite Nova instead? You need a team in Florida. Miami would be obvious if they are still around. But if they are not, you are left with UCF (are they leaving the B12?) or USF. Does VA Tech get left behind? Does WV or Cincinnati leave the B12? Does Louisville prefer the B12 or a NE conference?
Non Big East
Army and Navy makes sense. I think ECU would be a good fit and there is some history there are an Eastern Indy. UMass doesn't add anything. James Madison gets you into VA and they seem like a pretty decent program.
So most likely the 10 teams would be SU, Pitt, UConn, BC, Army, Navy, Temple or Nova, James Madison, ECU, USF. If you are lucky you get WV, Cincy, Louisville, UCF instead of JMU, ECU, Army, Navy. If you are really lucky then VA Tech and Miami are still around instead of Cincy and Louisville.
If you are looking at the best combo to create one league for both sports then I think you see SU, Pitt, UConn, BC, Nova, Army/St Johns, Navy/Georgetown as your core. You need a Florida school for recruiting. So in order Miami or UCF or USF.
Now you need two more schools. I think Duke if available is #1. Then VA Tech, WV, Cincy, Louisville. Then a 2nd Florida school. But it is possible that none of those teams are available.
If ND is still Indy in FB then you can add them as well to give you 11 in BBall. In FB you get a 6 game scheduling agreement with them. That way you play ND home and away every 4 years.
I think best case in a left behind would be...
SU, Pitt, UConn, BC, Nova, Army/St Johns, Navy/Georgetown, Miami, VA Tech, Duke, Notre Dame
That is old Big East FB minus Rutgers, Temple, West Virginia and plus Army, Duke, Navy, Nova, UConn. Which is clearly worse.
It is old Big East BBall minus Rutgers, West Virginia, Providence, Seton Hall and plus Duke. Which is clearly better.
Edit
Unless you are willing to go to 22 games in BBall. Then I would say take away Army/Navy and add West Virginia. So you are at 9 in FB and 12 in BBall. In FB you play ND home and away over 3 years.
Which is old Big East FB minus Rutgers/Temple and plus UConn/Duke/Nova. Which arguably is a better conference. Miami, VA Tech, and SU are down but would have an easier time getting back. WV and BC are the same. Pitt is much better. UConn and Duke are way better than those Rutgers and Temple teams. Nova would likely be better than those two as well.
It would be less FB inventory, more BBall inventory, and more quality FB inventory (WV instead of Army/Navy).