The educational world is HUGELY into SL. They tend to need:
a) realtime chat
b) voice chat
c) slideshows
d) privacy
e) scriptability for varied needs
f) free
g) no infrastructure setup
Name another virtual world where they get that?
1) There aren't any 2d environments that offer all the above (yet, bc Metaplace already offers most of that).
Umm....Raph? You're soaking in it. Everything you talk about, the old-fashioned Internet 1.0 does. And it does it better, more transparently, more intuitively, and in multiple ways you can mix and match.
The "3D Web" never catches on because people don't *need* it. It doesn't add anything. You get all the intuitive baggage of realspace, but with all the confusion of being able to break the metaphor at any moment. When 3D actually *adds* something, Java or Flash steps in and gives it to people, embedded into the 2D web pages. On the other hand, 99% of the "webby" things that the "3D Web" does, it does in embedded 2D, badly.
What the "3D Web" is good for is very ornate rounds of "Let's Pretend". "Let's pretend we're in Star Fleet." "Let's pretend you're a horse and I'm a squirrel, and at least one of us is a girl." Virtual LARPing. And the most ornate and fantastical of them: "Let's pretend we're characters in a Neil Stephenson/Bruce Sterling novel, and this is all the prototype for Cyberspace."
--Dave