To suggest 1 btc was traded on the silk road 9 million times is ridiculous but I get your point, although I still disagree with it. In any Econ 101 class one of the first things you learn is trade is the foundations of any economy and hence currency. Even backed currencies are limited in value when not suspended in a medium of healthy trade. As you said btc is a currency of speculation, in fact PURE speculation. BTC isn't limited by even a rate of production, its just code and encryption. The value created by trade isn't a linear relationship its exponential and even if more conservative number would assign 40% of transaction on the silk road this would be the equivalent of 40% of US businesses disappearing overnight. The crippling effects of losing the SR are compounded by the exact reason you state, btc is a speculative economy and lately speculation is largely negative. People will believe bitcoin is worth less without a marketplace to fill the void SR left. Not every btc user has to use drugs in order for the market to recognize the volume of trade created by SR. That's like suggestion every American has to own a fighter jet to recognize the volume of trade created by lockhead martin.
thank you for pointing out the obvious.
no SR - > less btc trades - > btc value going down
lulz...
So why is the Bitcoin price up by $20 then?