My opinion about Tor is that you don't need it. One doesn't need that level of privacy in every day online activities. If someone really thinks that they need it, then I really want to know what they do in real life, do they move with hoodies and mask everywhere they go? I still think that 2 million users for Tor is quite a large number.
Satoshi would have definitely been one of those people. You can't be walking around nowadays with a million bitcoins.