To be fair, this isn't very hard; MoMa is actually a fairly cramped and crowded museum.
Also, you guys are dreaming if you think the BSA space will be a draw for anyone who's not an archigeek heading to the exhibits. If anything, I'd imagine the new location will be a huge handicap for the society attracting people who don't keep tabs on the profession...there's not exactly an active streetlife here that would suck people in (businessmen rushing back and forth to South Station aren't exactly likely to just pop in for a leisurely arch exhibit).