It's believed that the great and beloved Satoshi lord of all things Bitcoin premined a million coins. If he's dead those coins could be permanently lost which means there will never be more than somewhere less than 20m Bitcoins. If Satoshi is actually a team at the NSA then they will re-enter circulation when the US Gov decides to crash the price of Bitcoin down to nothing
Should Satoshi be somehow affiliated with the NSA in respect to Bitcoin development and design, Bitcoin should better be considered as doomed already. And his 980,000 bitcoins would be irrelevant since the NSA obviously wouldn't develop a system for public use without leaving a backdoor. In the case of Bitcoin, that would effectively mean that they could easily get access to any wallet which has been created in the past or will be created in the future by quickly computing the private key through that backdoor. The only way to get rid of such a possibility completely is to change the hashing function behind Bitcoin to something not developed by the NSA or similar entities...
But that would mean a hard fork as far as I understand