Have you tried VR?

Glass & 3D TV never added anything meaningful to the mix. They were just extensions of technology that already existed. VR entirely changes the paradigm of how we interact with computers.

Even if it's "only" VR gaming that takes off, that is an entirely new medium of storytelling for artists to explore. We don't see those often.

Remember that DOOM was more popular than Windows - games are often all the system seller you need.

There's no way VR is just a fad. It's unimaginable that our interface with electronics is going to be a 2D screen forever.

Yeah, it's clumsy and annoying now, but I don't think it'll be for much longer. The Quest is super usable already.

VR is a fundamentally different technology than both 3d TV and Glass (which is very successful in industry, and AR in general will be very valuable in those applications going forward).

Yes, Glass and the few competitors are somewhat successful in industry. That's what I meant with "special purposes"

Still the number of units sold are probably reported in 10Ks or 100Ks not in millions let alone billions of units.

AR might be the winner. In addition to the clunkiness of the gear that you mentioned, it's a bit disorienting (and sometimes unsafe) to be removed from your present environment.