Create one client for both Yammer, Teams, Skype and Skype for business
In our company we are using skype for business, teams, yammer as well as other communication tools. I would love to see one client where I can monitor and participate in all different channels. I have seen 3'd party tools for this that support slack, Skype, instagram and others.
Having a client that brought all the different communication channels together for the O365 would be great. I think it could be done without taking away each channels advantage. I have seen that Yammer for example evaluates using skype for chat instead of yammer chat. Each service has it own set of strengths making it better for certain situations. Also for a large company the adoption rate is always difficult to control and perhaps not even something we as a company want to control.