This is an excellent writeup. I think it misses an important trend in the Web's population: fewer nerds. It used to be a lot of work to get a PC with a broadband connection. Now every cell phone has cheap broadband and a suite of apps built in. The Web today is mostly populated by users who are not enthralled with the technological underpinnings that make it possible. And that is natural. The the lamentable effect is that now there is a market for accessible communication and media. And this is overwhelming the traditions of sharing and valuing anonymity on the Web.

I imagine the nerd population has grown, and accelerated over time. It is just that the non-nerds are getting on-line much faster.