Get in fiat Quick we are done, this is it.
Why sell BTC because MTGoxBTC/MTGoxUSD is crashing? Once the market determines that BTC and MTGoxBTC are not really correlated, BTC will sky-rocket, just as it did once it became clear that pirateat40 way not going to pay any BTC back in late 2012, as there were no BTC to sell.
One cannot sustain a naked short on BTC for ever. So I say take delivery, hold and watch the naked shorts get squeezed to the wall. It will not be pretty over the short term but once it blows over it will be very profitable.