Even with the Fed guaranteeing liquidity BSC is probably toast - nobody will risk the recriminations of keeping money with BSC when they can move it, nobody will do an OTC deal with BSC as the counterparty. As Dhyde said "the death spiral you are in becomes self-fulfilling"
If a Bank loses access to credit lines/standing it can't function, it is toast. It took just minutes (minutes not days) for Banks to pull their quotes on Refco's Currenex.
If BSC goes down then so do all the OTC contracts it wrote, which means now what you had hedged is no longer hedged - bad balance sheet implications throughout Wall St. This is why the "Federal" reserve is actually acting to save BSC. Strictly speaking if you chose a weak OTC counterparty it should be your problem. If it is big enough to be a systemic problem then maybe the Fed is justified in the short term - a collapse of the banking system is in nobody's interest, but I also suspect there is what the US called "crony capatilsm" in the Asian crisis at work here.
A year ago $2b to anybody was nothing, now we have 40 banks to lend $2bn to a major IB, I mean 40 - that's $50m each - looks like they are spreading the risk as thin as they possibly can..........................................