Over on my mailing list, the WFTL-LUG, a "whatever happened to" discussion has emerged in part because question traffic has gone down dramatically. Fewer people are coming out to LUG meetings. It's as if Linux is fading away.
"Has Linux dropped off the face of the Earth?" The answer is obviously no. Linux is still around, stronger than ever, but the desktop OS does seem to be disappearing. Of course this is true of Windows and Mac OS, at least from the average user's perspective. Desktop Linux is strong with those who use it; those who have been using it, but the buzz seems to be gone.
None of this surprises me though. Sure, we may never see the Year of the Linux Desktop, but the nature of the desktop is changing. People are increasingly living their lives online. Yes folks, it's that cloud you keep hearing about and it's really out there. Google+ and Facebook and Twitter and online document management and email and just plain old Web surfing. For most, the network really is the computer and as time goes on, people care less and less what is running on their computers and more about what they can access once they get online.