No way. What you forget is that once they bust it -- then they've REVEALED that they have the capability to do that.
Once they've revealed that, then people take account of it, and it becomes harder for the NSA to monitor them.
Half of the signals intelligence game is keeping your capabilities secret, so you can keep monitoring the signals, rather than have your target change their game.
That is to say, if they can get into Silk Road, then they probably ARE already monitoring everything that happens on Silk Road, and they'd rather it stay UP so they can keep monitoring the people on it (being very careful never to reveal that they can monitor it), then bust it so the people go elsewhere.
Once they've revealed that, then people take account of it, and it becomes harder for the NSA to monitor them.
Half of the signals intelligence game is keeping your capabilities secret, so you can keep monitoring the signals, rather than have your target change their game.
That is to say, if they can get into Silk Road, then they probably ARE already monitoring everything that happens on Silk Road, and they'd rather it stay UP so they can keep monitoring the people on it (being very careful never to reveal that they can monitor it), then bust it so the people go elsewhere.