* attacks are hard to predict
* law enforcement is interested in attacking
* being hosted on a single server is just one way to make something attackable
* the proposal needs more work
* whether this actually works is an open question
* the real question is whether law enforcement will be able to attack
In a nutshell, this is circular logic that ends where it begins, and makes no journeys elsewhere. It makes no technical criticism of DarkMarket, references no historical or similar examples, and offers no extra information from other sources (such as the source code).
So, I down-voted, and wonder why all the up-votes.