IMO a broadchurch socialisation server would be bad, Cong and Firebot have like 0 userbase overlap, mainly because the two pulls of each subforum are completely different. Circus has about a half and half of people likelier to participate in Cong or Firebot so you could argue we're the bridge, but we're not actively bridging anything rn and I don't see much sense is trying to force us to. BBP is its own thing entirely.
Merging with SmORGon makes sense, because mafia and ORGs are the two category of games we do on this site (basically, also Walrus which has its own server entirely). There is semi-significant player overlap there, due to the nature of ORGs being application-based that overlap is never gonna be that consistent, but a lost of ORG players started out playing mafia and then their communities tried ORGs out (exactly what happened here) so mafia being publicised in the ORG server and people giving it a shot is probably the only benefit, but it's not like there are any detriments to it.