I agree with the overall point you're making. The only problem is finding a way to stop criminal activity on OpenBazaar. If it truly can't be taken down by "tradional means" like D Dosing, etc, then the only other options I see would be taking down the nodes, or w/e keeps it running,
Exactly, Investigators will actually have to commit real man power and conduct formal investigations thus making the costs of regulating drugs/piracy/gambling/guns much more expensive.
This is a great thing if you believe in personal freedom and that victimless crime laws are unjust and immoral. Otherwise, if you are a control freak, and you can't stand the fact that someone has the right to peacefully exchange good and services that you don't approve of than good luck trying to shut it down.
Here is something to ponder: Has wiki-leaks been stopped? Has torrenting been shutdown?
The beauty of this technology is statists political beliefs don't matter.... history is unfolding and you need to brace yourself for a much more liberated society and deal with the repercussions both positive and negative that come with such.
Wikileaks is very centralized and technically has not broken any laws.
The activity that will likely occur on open brazzar will be much more illegal then torrenting. There will be much more evidence of such illegal activity as well as actual physical addresses must be used to deliver goods.