But, as many have noted on this thread, they will simply find ways around these obstacles. So, it's just another form of cat-and-mouse in a game we are destined to lose, as their resources are virtually unbounded.
In all, it really goes the long way around getting done what really needs to be done: change and clarify laws which bring the NSA back under heel.
IMO, pursuing anything else outside of legal redress as a primary goal (including pure technical solutions like encryption) is simply assuming the wrong posture. It concedes their right to do these things, as long as they can skirt the chestnuts we try to shovel into their path. In this, we allow ourselves to be put at odds with our own government and abandon the rule of law, as well as the very principle that our government works for us.