There's a number of things that have happened in the organic search area of Google that seem to suggest a declining interest in quality organic results. There's Matt Cutts' long leave of absence, his departure, and the announcement that he's not really being replaced. A much lower volume of communication from Google on initiatives in the space (they used to talk endlessly about Panda, Penguin, etc). Amit's original r…
I'd add another item c) "Search" is changing towards giving information rather than to websites. Think Siri/Cortana/Alexa. Even Google tries to give you an answer rather than a website. Also information is moving from "spread thin" websites to social graphs and more centralised locations
Personally, at this point I'd rather pay Google a monthly subscription and get everything ad-free. That would align their interests with their users who would then be the customers vs the product and free up Google to do what is best for them in cases where ads may not make sense.