There was a story out the other day that commercial services like Google are starting to use encryption that is unbreakable, and refusing to let the government inside the shell. So increasingly the whole NSA might be a moot point.
You might find it amusing to google perfect forward secrecy. With PFS, they can't decrypt previous intercepts even if Google were to disgorge the private key in effect at the time.
But the truth is, you can't trust any channel unless you and your correspondent do your own encryption. Any encryption done by the channel is subject to compromise.