Probably not.
Cars weren't invented to make bank robberies more difficult to stop. These networks were invented, to a degree which shouldn't be dismissed when considering their acceptance by the mainstream, to make enforcing laws against trading in anything more difficult, if not impossible.
I think most people (not most people on HN, or in tech, but most people in general) would rather pay the extra few dollars than support the premise of a truly free market. While I would agree completely that there are perfectly legitimate uses for these networks, and there is nothing at all evil or malicious in the technology itself, I also think it would be disingenuous to state that their use in illegal activities is somehow orthogonal to their purpose.