Web 3.0 might be the meshing of the interactiveness of Web 2.0 with premium content that goes beyond YouTube. Think Joost, only evolved beyond crap video.
Web 3.0 might be content designed and built for the web, as TV transitions into an internet appliance (through stuff like Apple TV) rather than a one-way entertainment destination.
And until we start to see this stuff in full swing, Web 2.0 can't be officially declared dead.