(Aware of the fact that I'm taking time out of my day to read HN) I really wonder how many adults > 25yrs and < 60yrs have the time to immerse themselves in any type of digital world / metaverse experience. If I was a teenager or in college, then yeah I can see it... but there are so many things to do in the 16hrs we have each day, and I already kick myself for not finishing that book, or getting an extra workout in,…
But I don't think that's really the point. People use those 6 hours in a bunch of different ways. Some of those hours might be replaced by a metaverse experience entirely (as in, "I used to do play video games on my console, but I can get the same experience, but better, playing games in the metaverse"), and other activities might get nudged out because they aren't as (subjectively) enjoyable as the metaverse to some people. And other people will just not do the metaverse thing, because other activities are more fun to them. FB is betting on the user group being very large, and I don't know that I'd disagree with them.
And the same thing will always happen: people will continue to kick themselves for not finishing that book, or getting that extra workout in. That will continue to be the case with or without the metaverse.
Also consider that something like a metaverse could become the standard way for remote knowledge workers to get in a "room" together to collaborate. That alone seems like a large user base.