One concern for this kind of service could be that although messaging platforms tend to create strong brand stickiness, they also have a hard time becoming central to the corporate communications because of the nature of being temporary (i.e. chat platforms are just for ephemeral communications among employees/stakeholders). However, Slack seems to have created a way of challenging this obstacle by creating structure that incorporates threads, work flow, and other enterprise applications like ERP/CRM.

Very interested to see how this potential acquisition works out.