Ask HN: Wiretapping limits that prevent tyranny and satisfy security concerns

I'm curious what other HNers think about legislation that would implement a hard upper limit on the number of people who's records can be wiretapped by the NSA at any given time. For example, place a limit of 2,000 domestic wiretaps and 50,000 international wiretaps at any given time. The requirement would be that once this limit is reached, the NSA would have to evaluate all 2,000 existing wiretaps and cancel one of them, including deleting all recorded data, if they would like to wiretap a new subject. The way I see it, putting hard limits would force the agency to adopt processes where no single individual can unilaterally wiretap anyone with agreement from many individuals agreeing that the new person to be monitor presents a greater threat to security than any of the existing people being monitored. I know this solution doesn't completely satisfy staunch constitutionalists, but I'm trying to figure out how to be pragmatic and propose solutions that stop the forward momentum towards tyranny and start getting the momentum moving back towards liberty. We're a bunch of really smart people and I'm just trying to brainstorm what alternatives and limits the community here could propose that would still meet national security requirements and prevent the NSA's power from spiraling out of control as it continues to do.