As an asset class it's far too volatile even for someone who plays naked options. Imagine putting $10,000 into an asset class that swings 20-30% daily on a regular basis. Trading curbs eat your heart out.
As a currency it's too impractical and there are serious hurdles involved with turning central bank currency into Bitcoin and vice versa.
We think Wall Street plays a rigged game. Manipulating the Bitcoin market would not only be possible for someone with a small amount of capital, but the regulatory boards(SEC/FSA) don't seem to be interested in coming within 50 parsecs of the stuff.
Bitcoin is an interesting idea with the potential to change the world, sadly the world just isn't ready. More importantly the people running the world aren't ready.
The moment Bitcoin starts to worry a Government or a big bank they'll simply manipulate the market. Oh, and you wouldn't even know.