Just because people who are trying to sell you something aren't using it doesn't mean it's dead.

I've been using Ubuntu for 4 years now, and the latest releases are more streamlined and usable than ever. The mainstream distros have come an extremely long way in being more user friendly to non-tech users.

Also I have mobile devices, but still end up using my desktop a whole bunch for two simple reasons: 1. when you actually need to type something of any length a full-size keyboard is wonderful 2. its nice not to have to squint at a smaller screen to see what's going on.