It's actually gonna be alot harder than that if at all possible go after buyers I think. All address information was exchanged with PGP encryption that only the end user can unlock with a key. The markets database will just show the encrypted messages. Of coarse it is an option to send regular unencrypted messages but most vendors would not accept them, for the very reason that if the markets was ever compromised just like this. Now it is possible that they could back trace Bitcoin transactions to buyers that send straight from coinbase or other companies that will cooperate if asked, but that would be a lot of transactions to trace, it was a huge volume worldwide market pushing tons of heroin coke and meth, bet the juice heads can rest easy.