I disagree that the A10 is a stronger league. It is a higher profile league dominated by high profile teams. But for every Xavier and Temple, there are Fordham, LaSalle, SLU, St. Bonnie, Duquesne and Charlotte (and yes I know some of those programs are getting better or have been good at least once). A major problem the league has seen has been how to schedule with 14 teams. They have tried a series of schemes, finally settling on one that should work wonderfully for them.
Before all this Big East fallout, Seton Hall was already under pressure from Big East membership to increase its budget to be more in line with fellow league members. There have been overtures between the A10 and Seton Hall in the past.
The most likely thing you will see is a high-profile eastern-oriented league. This league will consist of the best out of the Big East and A10 orphans, and maybe even CAA schools like ODU, VCU and Geo Mason. What exactly that means is TBD. On the surface, one would think Butler, Dayton and Xavier would be included based on recent performance alone. SLU hasn't performed, but they have a market. Creighton is kind of in no-man's land...though an attractive school for a basketball-oriented conference of this type, they will probably need a travel partner to make it worthwhile. So who would it be: SLU, Bradley, Wichita, other?
So, the more A10 and CAA teams that would be involved in such a league, leads me to believe that there would be an Eastern league and a Midwestern League. The other problem Valley schools face is everyone wants East Coast exposure. It's why SLU is in the A10. So the more Midwest schools these leagues add, the more EC exposure the Dayton's, Xavier's and SLU's lose.
So really, it will come down to whose left and who's got friends in a position to help. I hope Bradley is having ongoing conversations with Creighton, DePaul and Butler. Similarly, I'm OK if we're talking with Drake and Loyola (two schools with which we have a long history), and I would expect other Valley are doing the same.