What's left? Excuse my naivete, but I'm having trouble imagining any bigger or badder news than what we've already seen to have any real or lasting impact on this train near future.
Bitcoinica could collapse,
BTCST could sink,
GLBSE could disappear,
the Silk Road could be seized or shuttered,
regulators could ban bitcoin,
a technical bug could fork the blockchain,
or, worst of all, MtGox could implode.
If none of these risks end up killing Bitcoin, what serious risks remain?
*cough* BTC-e *cough*The prospect of impending doom is greatly diminished.