I am not for massive monitoring of people's numbers, its not only not "reasonable" but it is also a serious waste of resources that should be narrowly targeted.
So I would say that your scenario should lead those responsible for implementing the program to drop you off the watch list in short order. The reason you got on the list is important though. If it's tangental, as you say, then I would monitor your number to determine if you are continuing to be tangental to known terror #s or if you are only calling your aunt Edna. If you keep showing up in the loop, then you should tapped. If not, then dropped. Are there instances where the feds have monitored totally innocent people. Yes. Should they do everything they can to avoid that mistake, yes. Is it a crime for them to make that mistake. No.
A good example of that would be if we had been monitoring Atta (like we sure as hell should have been) and he had an american girlfriend. The Girlfriend is checked out and is clean as far as her known history goes. But knowing Atta was on a terror watch list, would I condone monitoring the GF's calls? Yes.
Does the occasional mistake make me change my mind and concur that warrants are needed? No
Okay - just so I'm clear, you don't believe a warrant is necessary to monitor such people, right? So warrantless wiretapping is not only okay for 'those who call terrorists or are called by them' or for those with a 'serious indicator of belonging to Al Qaeda'? It is also okay for those US citizens who just happen to get caught up in some kind of data mining or other electronic surveillance activity, whether it be happenstance, or coincidence, or whatever?
If that's the case, fine - go forward from there. But in discussing this I wish folks would stop talking about wiretapping 'terrorists and those who call them,' because that is not ALL that is at issue here.