Isn't Facebook the biggest culprit of web? Their walled garden approach and lack of social network portability is what I feel is killing web more than anything.
We almost have the tools now:
* cheap or free blog hosting with easy markup and non-public posts
* self-hosted commenting with a URL field for commenters, enabling discoverability
* friendly RSS readers (I use NetNewsWire)
* password management built into most systems and/or browsers, to keep track of individual logins
There's work to be done to make it more user-friendly, but all the tools are there.