What you are observing is part of the phenomenon of meta-contrarianism. Like everything Yvain writes, the aforementioned post is well worth a read.
I don't know. Metacontrarianism, as I understand it, involves taking specific positions solely for the sake of differentiating oneself from others, whereas many of the status quo explanations (e.g. Yvain's recent post on weak men) seem like they actually have definite intellectual merit as well.
My explanation would be more something like "LW was originally quite dominated by Eliezer's ideas, but over time and as people have had the time to think about them more, people have started going off in their own directions and producing new kinds of thoughts ...
Previous Open Thread: http://lesswrong.com/r/discussion/lw/k94/open_thread_may_19_25_2014/
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should start on Monday, and end on Sunday.
4. Open Threads should be posted in Discussion, and not Main.