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Has Google's main focus turned in a different direction (products, Government - see cage codes 6HU35, 1XAU1, 6MHC8) that has their search engine destined to become obsolete returning no content and/or old stale sites.
Keep in mind that I'm of the minority that believes Google will return mostly paid listings in the not so distant future.
For commercial queries? Maybe. For informational queries? Unlikely, because most sites that aren't in the business of selling things can't justify advertising or have no motivation to advertise.
If those ads are more useful than the organic results (as they often are, especially in the case of Product Search listings), then it's a win-win-win for searchers, advertisers, and Google.