You actually believe these FBI/DOJ notices that you can't hide? lol someone promote that public relations agent to a GS-15!
Darknet markets are bigger than ever, more hardened than ever, the investigations and busts are more expensive than ever and the results are smaller than ever.
This operation got a win because the server was seized and accessed. That part isn't supposed to happen.
Further hardening is that messages shouldn't be on the server. Everyone on Tor says use OTR on Jabber, EVERYONE.
On top of that, funds shouldn't be stored on the marketplaces, marketplace centralized escrow is still prevalent but multisignature is what should be used. (transaction is revertible by customer and merchant in the event that the escrow agent is incapacitated, customer and merchant can form a transaction again with the same funds elsewhere, or not, either way the state gets nothing whether they seized the server or seized the marketplace's wallets)
Next, bitcoin should be less used and Monero should become more used.
Monero with multisignature should become more used on top of that, which is not something I would consider "production ready" but following busts like this people might just prioritize developing it better.
There are a couple of inconvenient marketplaces that do all of the above. The user experience just has to improve.
After a certain level of abstraction the liability will shift away from the marketplace operators, or they'll evolve into completely unmanned autonomous organizations, in both cases they will both evolve into places where we really won't know where earnings go.