There's a few games and communities that, I believe, create the same experiences but for a different generation.

But first, remember Eternal September; basically it will never be like it was back then, even if it is exactly the same. See WoW Classic.

Anyway, I think people are experiencing the same things nowadays in games like Runescape, Minecraft and Roblox, where in especially the latter two there are a number of servers offering MMO-like gameplay, including heaps of weird bugs. I wouldn't recommend them for people looking for an UO experience though. I never played any of those myself.