Bruce Schneier wrote an article on the Guardian in which he argues that we should give plausibility to the idea that the NSA can hack more forms of encryption than we previously believed.

Prefer symmetric cryptography over public-key cryptography. Prefer conventional discrete-log-based systems over elliptic-curve systems; the latter have constants that the NSA influences when they can.

The security of bitcoin wallets rests on elliptic-curve cryptography. This could mean that the NSA has the power to turn the whole bitcoin economy into toast if bitcoin becomes a real problem for them on a political level.