So with an ever growing number of sites completely disappearing from the regular index and finding themselves lost in the mass of unranked supplemental pages one would think that Google's result quality should be suffering.
While Iwould agree that the supplemental issue is a giant ball of problems for Google, I would not say that the issue is escalating since last January.
The next question that comes to mind is: WHY oh WHY, are they not removing these scrapers/spammers from the AdSense program?
How are they suppsoed to determine the site has scraped content, with people handing out their articles to hundreds of sites on a daily basis? How does Google distinguish from a regular dupe article published by permission from owner and a site that simply scraped it?