I think if the NSA had the ability to disrupt the security model of Bitcoin's fundamentals, they would have done it by now.
But doing so would have risked revealing their possession of backdoors to other forms of commonly-used computer security as well. At least that would have been a concern until Snowden revealed the extent of their access, very recently.
Well, I still think that as per the Android PRNG issue, people have lost their pocket change as a sacrifice to everyone elses improved understanding of what is and isn't possible. Someone pointed out that the politics of currency isn't the NSA's raison d'etre, and that remains so until and if they are assigned a cryptocurrency takedown notice form the people who do make it their business. In the meantime, I'm glad that the discourse about the ECDSA vulnerabilities is playing out amongst the core development team, and if we need to change things, then change they will. It's not the ideal circumstances to have to alter the cryptographic underpinnings, but I don't know how else we could have expected such a change in perspective to play out. It could be worse than a single government source of (still not definitively a) compromise.