The title is just silly and unrealistic.
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. ;)
This site has already been discussed three days ago:
You won't need to shut it down. Just go where the money flows and arrest anyone selling illegal goods/services. Eventually, when sellers know that it's too risky, they just won't sell there anymore.