But that's not to say it's not possible for a mainstream-successful iteration of the idea to exist. My personal feeling is that there is a viable path to mainstream success, though it's far from guaranteed that a player succeeds in taking said path.
The real question IMO isn't "can VR/AR be made mainstream successful" (this is largely unknowable until someone does it), the question is "can FB be the company that makes VR/AR mainstream successful".
And IMO the answer has always been no. If there is viability in the entire subfield I think Meta is poorly positioned to be the tip of the spear.
Its fundamental business model works against the interests of good products in this field (stuff every virtual surface full of ads! Inescapable eyeball tracking for MAXIMUM CONVERSION ATTRIBUTION!!!1one) - one can make a (good) argument about the implications of Meta's VR play with the interests of humanity, but I don't think we even need to get that deep. Their business model fundamentally is at odds with creating compelling products in this arena. So much of their product strategy seems to be stuck in the hole of "what is good for Meta" instead of "what is good for users".
And then there's seemingly the perennial issue of FB not being able to ooze any kind of desirability or cultural cachet, which is deeply necessary for any of this to reach the mainstream in a big way. Everything it touches, even before the VR/AR pivot, is like an even more corporate and dead-eyed version of EPCOT.
I don't personally see what's controversial with that claim and bet. Separately one can argue if the current tech is anywhere near good enough to achieve the N% gains but the common thread of VR/AR/metaverse as being a useless product forever is a textbook example of missing the forest through the trees.
And when I have it for work the play becomes more realistic.
So for me that's the killer feature of VR - portable monitor replacement - you can take it anywhere, pop it on and you're instantly in your virtual office. This would be worth 1000s $ if it "just worked" like Apple products do.
Apple and Microsoft are the only tech players I could see pulling this off because of the OS integration required. And Microsoft failed with Hololens.
The day I tried HoloLens I quickly saw there is much more potential in that tech than many thing.
A 360deg screen that you can take anywhere with you and that can give you a true field of depth / 3d view. When the devices will perform well enough and be portable enough, this will become huge.
It's not done yet. AI is the current buzz because we are starting to see some great products and uses for it, we have yet to see that with VR/AR but that doesn't mean it isn't possible. It's still early, I am not a fan of the 'metaverse' idea, but VR/AR still has a lot left to give.