Are we stuck with the same Desktop UX forever? [video]

This is a bad example because it's solving a problem over a much more constrained domain.

A UX revolution in teeth-cleaning technology would probably look like some kind of bio-organism or colony that eats plaque and kills plaque-producing bacteria. In an ideal world you wouldn't have to brush your teeth at all, aside from an occasionally floss or scrub.

Disagree. You're ignoring cost completely (end to end including R&D, manufacturing, logistics, testing, approvals)

I can have a personal dentist brush my teeth while I lie down.

There's a point where UX-that-works-at-acceptable-cost is good enough.

Maybe desktop UX is like the shark. An evolutionary dead-end, but it gets the job done extremely well. (Would be cool if they have lasers on their frickin' heads though)