Sgt_Kickaxe - 11:12 pm on Jun 5, 2012 (gmt 0)
Two prominent search team members, Matt Cutts from Google and (temporarily forgot his name) from Bing, got together at an event recently and discussed what is most important to them. Tops on the list was influence, social and other. Second on the list was schema markup.
To me that suggests that you need to write in a manner that makes your content as sticky as it can be and you need to pay attention to your code so that it tells search what you are writing about using schema(.org).
In that sense, yes, quit targeting keyphrases and write in your own (hopefully unique) style to garner the most influence you can by providing GOOD VALUE.