3. Aging Poster Children:
Flickr and del.icio.us are absolutely terrific examples of the new face of Web 2.0. But are they truly setting the world on fire? Will those of us that use them die if they went away (OK, some of us might). But my point is that these guys are getting a little long in the tooth in Web years and while very good, their functionality is nowhere near as central to our lives as say Google, which is already 7 years old.
6. Excessive Attention On The Technology:
... Technology is the outlier in Web 2.0, the magic behind the curtain (but behind the curtain darn it) and I think it's really hard for some of us to hear. Communication, collaboration, collective intelligence, and social interaction between people is what Web 2.0 is about so much more than the technology pieces. If we forget that, we'll lose Web 2.0 to the application marketectures and technology stacks that most folks in the real world have never cared about in the first place.