Many of the Web 2.0 crowd are clearly smart, but what they do is far removed from the current focal point of global change. As a result, indulging in clever Web 2.0 thinking is akin to eating intellectual fast food, it satisfies but its clearly not good for you.
This is why I bailed on thinking about techy topics after helping to get blogs (which turned into Web 2.0 later) going back in 2001/2002. The most important global changes are going on is much deeper in the stack now.
Inded, much of the planet doesn’t have reliable water, much less electricity. So, the latest shiny web 2.0 widget, however wondrous, is of use to only a tiny fraction of the world’s population.