Google's index is not a public service and they can manage it how they see fit. I really don't see any point in griping about this change since it really did have the internet as a whole in mind. A few "big wall st companies" have produced mass numbers of "articles" to try and dominate search results but those articles are OFTEN of extremely low quality, even if that company is issuing press releases stating otherwise.
If the content was of good quality and original it's rankings didn't suffer, at least I've yet to read a claim by any site I feel is seo spam free.
I'm seeing a boost in traffic but I've never simply added hundreds/thousands/hundreds of thousands of articles just to cover my SEO keywords. Now I'm glad I didn't follow that trend.
P.S. I must have missed the hordes of people complaining about the change on this site like the article says... /shrug.