I selected 'No' The battle for supremacy in enterprise collaboration and messaging will be won by the company that can best blend personal assistants and proprietary analytics, with a focus on business productivity. Google is so well positioned for that. Why not focus on that as a distinction and then build the rest around that?
The functional overlap of Slack and Hangouts would also require some rationalization, which would likely be a challenge. Both vendors offer platforms that support APIs, third-party and custom integrations, and extensions into other vendor ecosystems, so decisions would have to be made about strategy and prioritization, as well as logical avenues for consolidations