No, there will never be accountability for any of the gross abuses of the constitution, people's rights (including all those in the USA) and foreign "captives" physical and mental wellbeing highlighted in the NSA and CIA revelations.
Let's not kid ourselves. Representative democracy has shown itself to be a charade, particularly in the USA where you've two very similar entities who have billions pumped into them at election time to ensure no other entities have a shot at power, and then once elected those two very similar entities spend their time serving and protecting those that pumped in those billions.
The worst thing about it that I can't see any way out of it for the American people. The system is now so thoroughly stacked against them that any attempt at radical change - whether it's passive through the political system or more active through protests or at worst a revolution - will be very rapidly quashed. As a European I absolutely loathe that this very same, corrupted, abusive entity - the US Government - is reaching its tentacles into our governing and is now vying for power here via the TTIP and similar.