I'm going to guess that more than half of the AAC is not on the same page as UCONN (full cost of attendance, paying stipends, etc). In fact, the only non-P5 schools that I would think, although I have no idea, are on the same page (or at least part of the page) are BYU, UCF, Cincinnati and possibly USF. I don't think Boise is willing to go all-in for all sports although I do think they would just for football. Ditto for SDSU, Fresno St, and maybe Houston. I have no read whatsoever on Colorado State but if they decided they wanted to play, they have the enrollment and alumni base to warrant it. BYU is interesting because I do not honestly know if there is a potential religious impact/barrier but judging simply from national brand recognition and revenue alone, they are a no-brainer in terms of ability to create the revenue to support such a move.
At the end of the day, I think UCONN will be fine. UCONN has the resources, the brand, the revenue stream, and backing of the State legislature. UCONN operated just fine in the old Big East and has even added to its athletic budget with the addition of hockey despite being stuck in the AAC. If a split were to occur, I would guess UCONN would be added. It wants to play by the same rules as the other "big" schools that can generate the kind of revenue that UCONN can.