Convergence - 6:18 pm on Jan 8, 2013 (gmt 0)
The reasons for HAVING to diversify is because the Google's goal IS to provide that "one right answer" - That "one right answer" is to keep the visitor on any of the Google's web properties until such time the visitor clicks on a revenue producing link - the Google's revenue producing link.
Not going to argue if the "one right answer" is "right" in my eyes - is what it is. The Google can afford, at this point in time, to serve up less than right answers 100% of the time.
There's a great video created years ago called EPIC 2014 - worth watching. Erie how accurate the creators were able to perceive what the Google was becoming. Search for it on Bing <snicker>. Life imitating art.
Not trying to beat a dead horse, but like TMS, I think it's important for webmasters to understand why they need to diversify and why they need to adjust their marketing efforts to not rely solely on the Google. They exist to make money, not friends...