> Wearing headsets isn't. If we can ever build AR glasses (and that's far from a certainty) then maybe that might work but there are significant technical problems (eg matching focus, true blacks).

I've said this same thing a thousand times. It's not lack of content or use-cases killing AR - the tech just isn't there yet. Form factor is one of the very pressing issues. It seems inevitable that the tech will get solved, but it's not clear whether it's a couple years or a couple decades.