Despite this, I'm inclined to agree that the web is threatened. The desktop may be defined by local files but the web wasn't defined by remote ones. It was more about the culture. More about anyone-can-publish. To me, that's the baby at risk in the mobile bathwater.
That, and any aspect of personal computing that can't be performed on a phone. Which is most of them. I'll stick with the hemorrhoids and circadian disruption, thanks.
My wife and I were talking about this the other night: It's not that people who learned to compute on the desktop are abandoning it for mobile. It's that most people couldn't handle desktop computing in the first place. It's too abstract (dare I say difficult?). So the mobile revolution is really about the unwashed masses computing for the first time. Perhaps that's why mobile apps and operating systems eerily remind me of soap operas and reality TV.