Respectfully I think what the past has shown is that the people who can nail this aren't "in the building" so to speak @ Google. They have fantastic engineers but I'd argue a true unified communication tool is primarily a UI/UX challenge. I'm sure they have great UI/UX people there but this does not seem to be a key part of their culture.

This was a mistake on my part but it was my singular ambition in life to build a messaging company to sell it to them to make money off this problem. After moderate success (several million in revenue) I reached out to them and they blew me off. So at least in my experience they aren't overly excited about acquiring companies to get people in the building who specialize in this.