That's exactly what I've been writing under every blockchain thread on HN for the last two years: the only real need that blockchain solves is buying drugs. It hasn't taken over US and Europe yet (I presume because of progress by the legalization movement), but in Russia and CIS, there are no drug dealers that you meet anymore: anything you buy, you buy anonymously, through Tor and Bitcoin, without ever meeting any real person.

That's the only industry blockhain could disrupt, and it completely disrupted it. (I'm not sure about money laundering as I've never really know much about it).