I agree, no idea why you are downvoted. At my job the Slack was forced on us by boss, probably because of the hype, we were using Skype before and we still use

I agree, no idea why you are downvoted. At my job the Slack was forced on us by boss, probably because of the hype, we were using Skype before and we still use it because the team was used to Skype, it worked good enough, slack just added for us extra distractions. I think that even a good alternative appears if the hype is not enough it won't catch, also before Slack we used Hipchat for a short time, same story, it was imposed to the team because of the hype, in the end Slack got a bigger hype I assume.