Interesting, and for the most part sounds feasible. But for me, I'd rather check my Inbox than Twitter. And I'd rather people emailed me than called me, since

Interesting, and for the most part sounds feasible. But for me, I'd rather check my Inbox than Twitter. And I'd rather people emailed me than called me, since most of the time they'd get a voicemail which I would have to pay to retrieve, and then I'd call them and it wouldn't be convenient, and then ... And while some things (think long discussions) are done better verbally than by email, there's a lot of other things (like Reports from clients, or my global office) for which email is the only alternative to actual mail (since, and again this is for me, the chances of any of them diving into Google Docs or Wikis in the next 3 years is negligible).