Planet13 - 7:40 pm on Jul 9, 2013 (gmt 0)
"Maybe Google is so worried about spam, and its continuing inability to stop spammers, that it's decided that the only solution is to fill up page 1 with these megasites."
that could be.
In the long run, the trend toward megasites at the top of the SERPs would probably not be overly beneficial to google, since it is something that bing, DDG, yandex, and pretty much any other search engine would be able to replicate easily.
Really the value proposition of a search engine (to its users) is to deliver quality results that would otherwise normally be hard to find.
so by delivering obvious results, how much value does a search engine have for its users?