Why not? Step 1: G+ is integrated into Google Apps for Business. Every business account is tied to a G+ account. Step 2: Departments use it for communication.

Why not? Step 1: G+ is integrated into Google Apps for Business. Every business account is tied to a G+ account. Step 2: Departments use it for communication. The CEO uses it for top-down communication. It's no more or no less secure than email as it is, but it gives a better way to manage what was once email groups. Step 3: Instead of maintaining a Skype address book and an email address book, it's all bundled into one. Conference calls are simple to manage, and how far away is screen sharing and presentation features? G+ could, if Google were inclined, become a Skype killer, and a Lotus Notes killer, and finally become an Outlook killer. Now, I'm not saying that Google has the vision, or that Google has it in their DNA, but it is possible.