When the time comes, the Feds will find any pretext they like in order to shut down bitcoin.
I'm not saying such a thing won't be attempted in the future, but I am curious as how such a thing could succeed, lacking any kind of central entity or server? I just learned about BitCoin but isn't it completely decentralized?
I suppose an order could be made at the ISP level to restrict/cancel any packets that resemble BitCoin packets.