The drug war is already failing without these huge roadblocks. It will always still be possible to exploit endpoint security. Given the resource limitations of law enforcement, maybe we should focus those resources hunting down important crimes such as creators of child porn or people engaged in violence crime?
Good old-fashioned police work involving the postal system was how some Silk Road vendors were nabbed. It won't matter how secure your market is, if the authorities want you bad enough and you don't know how to do secure mail drops.
Kudos to these guys for undermining victimless-crime laws.
People said the same about silkroad, and look what happened.
Saying something like this can't be shut down is like saying there's an unhackable system out there. And really, historically, these online drug markets have been much more short lived than AFK drug enterprises. They have really lived by the rules of startups in that sense. ;)