Given that pork-eating flight school students turned out to be Islamist terrorists, I'd have to say the answer is no.
I hate to spoil your snark, but Islam, like Judaism, has a prohibition against eating pork. So you could argue that *not* eating bacon is a possible warning sign of terrorist potential...
Our success at preventing domestic terror attacks is usually credited partly to our ability to stop the terrorists from sending each-other money.
Uhm, what success? AFAIK, the only "terrorist plot" in the US that the government has prevented was that one where the idiots thought that if they blew up a fuel pipe at JFK, they could get an explosion all along that pipeline. Obviously, they didn't comprehend that for an explosion to happen, you need fuel *and* oxygen...
BTC is specifically designed so that government's can't trace it, or interdict the cash-flow. This means the anti-terror cops damn well better have a plan for if AQ starts a major BTC mining operation.
No, bitcoin is *not* designed to be untraceable. In fact, thanks to the blockchain, it's actually a lot easier to trace than normal cash. What's hard is taking the information from the blockchain, and connecting it to a specific individual or group. So it's pretty anonymous, but once a given wallet has been associated with someone like AQ, anyone monitoring the blockchains could extract a heck of a lot of info about where their money is coming from and going to.