Looking too much at the tree, and ignoring the forest at large. To me, ignoring basics spells disaster : Panda, anyone?
SE basics dictate:
- spider & store as much as you can
- work on determining content RELEVANCE as much as you can
- monetize in novel, unobtrusive & user-friendly ways
- don't be overly obsessed with PhD bs
- Keep It Simple Stupid!
There is a lot yet to be done on basics, that has not yet been done, before going into truly questionable & minute details about user behaviour.