Bitcoin is not yet established enough that a few warrantless wiretaps can't drive it into the ground (of major exchanges) [1]. The likelihood those wiretaps are

Bitcoin is not yet established enough that a few warrantless wiretaps can't drive it into the ground (of major exchanges) [1]. The likelihood those wiretaps are already going on increased, and the market is pricing that in. [1] Edit to clarify: Currently, I'd estimate at least 25-50% of bitcoin transaction volume is exchanging with other currencies. Shutting down the major exchanges will prevent BTC getting over the hump from a temporary medium of exchange to an actual currency.