Thanks for taking the time to draft this post on the forums Kate! Appreciate you a ton.
As a chronically online kid in the 90s/00s, I too am incredibly nostalgic about the old 2000s days (neopets! habbo hotel! runescape! maplestory!) but I wonder if that was a product of its time and it wouldn’t work now in 2024. Would anyone show up? I had a lot of free time back then that I don’t have anymore now. 
What kind of experience/feeling/vibes are you looking to experience again with this proposal? A large part of it for me was the experience of just hanging out with other people in a chill space. I wonder if instead of a full-fledged MMO, whether some sort of lite “graphical” chat client like IMVU, VRChat, Bondee etc. would deliver a similar experience.
I think Portals on Solana is building this sort of experiences for Solana NFT communities.
If we cut scope even further, perhaps it would be a very barebones “Sanctum Profile” app, where people can customise their avatar, write a bio, browse other profiles, and add people as friends – a nicer version of the Cloud Community Corner – Member List. Would that be compelling?