Google has become like a snake finding its way through a rock pile. You cannot predict which path it will take. Most site owners who depend upon Google traffic base their businesses on what Google has done in the past. It is hard to predict where they are going in the future. Google's current constantly changing nature has led to the demise of hundreds of thousands of formerly profitable web sites.
I think Google has reached a point of maturity where they have achieved their original goals and they have too much money in their pockets. They are now experimenting with too many useless "bells and whistles" that do not do anything to enhance their search results for most users. If anything, the current search results tend to confuse both users and site owners.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin