I mean for instance, what is more efficient between what most people do with their desktops now as opposed to a (stylized) vt100? Or even the electric typewriter (with a larger screen)? What drives a person to type on a desktop more than a netbook, for average use? It is safe to say that most people type little more than emails or short messages. How is "the web" as we know it better than specialized information retrieval devices?
As a programmer, I know the desktop will serve me well into the future. But I don't see the appeal for the average user.
We gave you an atomic bomb, what do you want, mermaids? -- I. I. Rabi to the Atomic Energy Commission