My personal belief is that the browser as we know it today will evolve to be more based around 3D, leveraging emerging technologies such as WebAssembly and WebGPU. As headsets become more widely adopted, WebXR is what will extend the web into VR.
There won't be a metaverse based around an app store model. It has to be open to everyone, built with standards and protocols in mind from the very start, and most importantly: no 30% fees from walled gardens.
I interacted with a lot of 3D content, games, apps when I was a child / teen but nowadays I largely prefer 2D for all my interactions with computers, be it games, softwares, etc. 3D just feels gimmicky and less productive than WIMP, especially on all the VR headsets I tried. I'm curious if other people feel different.
for most of the games and other VR entertainment stuff, this is precisely what the producers what of you. they throw around terms like immersive. they want you in the world they created and believe that it make the experience that much more when you forget about where you really are and believer yourself to be in the virtual place. there's a definite time and place for that idea, but have never once felt that the content i was "immersed" in really had me at a level of suspension of disbelief to the level the producers had hoped.
at that point, what is the point of it. i am not one bit intrigued by theZuck's vision. i do not want to hang out in a virtual conference room around a virtual conference table looking at cartoon versions of people because it's cute. you can cute the fuck out of it until the knob goes to eleven, but it doesn't make this boring as meeting any more enjoyable.
I think you might be conflating 3D graphics engines that render a 2D image on a 2D monitor with modern stereoscopic 3D headsets.