If I type "king" into Safari's address bar on my iPhone, even with Google search suggestions turned off, it prominently suggests "Wikipedia: King Games". Spotlight on Yosemite does the same.
Apple are quietly relegating Google results to second place or worse. Is there a better result in Wikipedia? In iTunes? In the App Store? On Maps? Spotlight highlights that; it's probably what you want. It's not hard to imagine deals with Amazon (tablet/ebook rivalry aside) and Yelp, too.
The remaining search results are supplied by Bing for Spotlight, Google for Safari. But I expect Bing to replace Google in Safari for iOS 9.
This is how Google will be dethroned. Not by someone building a better text-based search engine, but by Apple and Microsoft routing around them. And this is why Android remains so important to Google, and why Google were so anxious to prevent Samsung going their own way.