Microsoft has recommended turning off SMB1 support in the past: https://blogs.technet.microsoft.com/filecab/2016/09/16/stop-... - though perhaps not prominently enough.

However, you might be able turn off SMB1 support is if you still have machines with Windows XP or 2003. This is a similar situation to SSLv3 when POODLE was discovered, in that the difficulty of getting rid of old protocols, is that of getting rid of the last ones (Though I realise WCry exploits an implementation bug).