Virtual worlds. The "metaverse" of Snow Crash. "Snow Crash", the TV series, has been green-lighted by Amazon. That may drum up more interest. Second Life comes close. They've had a working system for over a decade and have with adequate solutions to most of the problems. But it's hard to use, and not that many people are interested.
Notice how all the sf implementations have a lightweight & fully immersive interface? You need tgat tech - and at a cheap commodity price - before you’ll see virtual worlds be a thing.
Until then you just have MMPOGs with some more creative options.