One major threat factor that Tor doesn't have a bulletproof solution to, and likely never will, is correlation attacks. It's been shown to be plausible that by observing the timing and size of packets, even without knowing the contents, is enough to determine that two relays are part of the same circuit.
Well, any system that relies on tunneling is vulnerable to correlation attacks. And drilling down by looking at traffic between autonomous systems. Unless it uses chaff to maintain constant throughput.
But will doing that be worth it to find someone like me? I doubt it. I'm just a hobbyist and writer.
