Another Thought Experiment: Even if the NSA Stopped Spying On Americans....

... they'd still get all of the same data. The NSA would just get it from the other members of the "Five Eyes", a cabal of English-speaking spy agencies.

So the Yanks would spy on the Brits, the Poms would spy on the Canucks, the Canadians would spy on the Americans, the Aussies would spy on the Kiwis, who would in turn, spy on the Ozzies and everybody would share everything, like a giant Playschool of Spooks.

As for the rest of us, we're fighting to keep some remaining tatters of our privacy, but we're kind of like one of those Japanese soldiers who were hiding in the Phillipine jungles- this fight is long over and we've lost. The spooks have been wiretapping all of us for well over a decade and, unless we're all going to march on Ft. Meade, hang Emperor Alexander and burn the place to ashes*, I don't know of fuck-all that can be done to thwart it. As I've written before, no matter who we elect to clean this up, they'll fall in love with the power at their command.

And even if we were to change the law and get the NSA out of the business of running the total information network, we have no guarantees that they'd pay attention.

So while we can keep on trying to regain our privacy and 4th Amendment rights, it's kind of like standing at Masada and watching the 10th Roman Legion building the siege ramp.
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* I am not advocating or proposing either action.  This is only a thought experiment.