Congress was spied on, a US presidential candidate that we know of was spied on... So imagine plain old American citizens... what can we expect?
If congress isn't willing to take back what they allowed, they aren't going to stop all by themselves. If congress tried, they'd get a lot of pushback. Just like the Armed forces would push back on a spending cut back even though the cold war ended over 30 years ago and our budget dwarfs any one else's.
But you see that same phenomenon in run of the mill operations like homelessness non-profits. Their heft and momentum keeps them going and if you wanted to dismantle them they'd put up a big fight and tell you that while homelessness has gotten worse without them it would be doubly worse even though they never made it better to begin with but their directors live well.