With that said, there is little reason to add more schools since the potential markets added would all be smaller than the existing ones.
St. Louis, Boston, Detroit and Cincinatti, even if smaller than existing markets, aren't exactly small or negligible, either.
Likely candidates? Xavier tops the list to replace the departed Cincinnati market. Dayton is a great program, but I see St. Louis and Charlotte topping the list abouve Dayton. Umass is a strtch but worth recognizing. If new coach Ford can turn the program around, it would bring back the Boston market, since UMass basketball in the 90's was bigger in Boston (so many alumni live there) than BC basketball has ever been in that city.
I don't see this group actively soliciting schools with discernably different (ie: non-private, non-Catholic) profiles. After the wranglings over the fate of the BE they should seek near-unanimous institutional compatibility. And while Charlotte and UMass may provide the highest appeal, the margin of difference over, say, Holy Cross, Dayton or others is probably not worth the risk in allowing future in-fighting. Especially over a UMass program where some supporters are still touting a future in 1-A. I fully expect them to embrace the concept of a collegiate level CYO, and it would have great TV appeal.
* Notre Dame: It's doubtful they would ever associate themselves soley with the likes of Cincy, WVU, South Florida and the rest of the BE. If they were to leave the BEBB schools, the Big Ten would top the list.
The 1-A members of the BE currently have superior facilities, and comprehensive national exposure via their football, to provide a more stable, wealthier home for any member. Without regard for the university profile, ND's athletics would prefer to stay with the 1-A members, IMO. But I doubt ND will be in position to dictate that condition and will find the Catholic schools allow the best combination of home for all sports and independence for football. IMO, anyway.