True, I guess it's possible to crack a password for a single user, especially one with a weak password. I was more thinking that it's unlikely they'll be able to crack the passwords of everyone who was in their database, and given that Slack has so many users it's unlikely for any single person that his/her password will be cracked.

Of course, even if they can't steal everyone's passwords, maybe the hackers will try to crack the passwords of higher profile targets.