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. ;)
Did the media industry shut down Bittorrent yet? Nope. Did the IT sec community was able to shut down Conficker after it went peer-to-peer? Nope. So going peer-to-peer is actually pretty invincible with today's methods I would say (although I am not an expert!) The question is whether or not they can implement the details well enough in this peer-to-peer market.