It's possible, but not too likely at all at this point, that China will reverse this decision. I don't know how far BTC will fall, but let me tell you this. If it falls to under $10 like this person[1] says, I'm going all in... $5,000 USD's worth because I'm a fool. If, by some improbable & unfeasible way, China does reverse and BTC reaches $1,000+ again my cheers will be so loud that everyone on HN will actually hear me.

1. http://www.businessinsider.com/williams-bitcoin-meltdown-10-...