In all the hype around Second Life you can sometimes forget that the real message is that 3D is now becoming a usable technology. Communities of people feel much more at ease if their synchronous communication takes place in a 3D immersive environment than when it happens in flat environments like chatrooms of fora.
Here´s the product presentation:
But more important: Sony's Phil Harrison in GDC 2007 Addressing some new Playstation 3 features like Home and Little Big Planet
It´s only the game industry ecosystem; might be that they have a first mover advantage!; - but: very powerful!
It´s all about social interaction, community, collaboration, static game content vs. connected device!
the adoption of this features will be very fast, I guess!