You don't stand a chance against a highly resourceful deliberate attacker, regardless of whether they're NSA or someone else (chinese, non-national, ...). I expect in the coming decade we'll see a digital armsrace which will end up in collective disarmament (through hardware-based security which cannot be bypassed) when it affects business in such a degree that the economy is harmed. There is one global constant in all nations and political philosophies: what is bad for the moneymen gets weeded out.