Way back in the day (Quake 1) I sent an email to Carmack at id Software,
where I laid out such a scheme. Never got a response, but interestingly in a recent interview with him in Wired magazine, he says that the sort of virtual world I've described is a "dream of his" and that he plans to work on it after they finish Doom III. Something like 5-6 years have elapsed...think he got the idea from my email?

Wewp.