At my day job we recently migrated away from XMPP for our internal chat rooms and IM (all on Slack now). XMPP worked fine, but, its one less service for us to maintain ourselves and everybody using a more consistent client by default instead of the mix of Adium / Trillian / Pidgin / etc has been nice from a feature standpoint. I think many other companies are in the same boat, based on Slack and Hipchat and the other chat-as-a-service providers having huge growth.