Isn't that irrelevant as far as Google's usefulness is concerned?
The internet is always going to be in constant flux: SEO trickery, the rise and fall of sites which contain the most relevant data, context of the search (browser -> phone), etc.
Google's main job is to make it as easy as possible for a user to find what they want. For example, as a techie, 15 years ago that might have meant making sure to constantly index usenet and various mailing lists. Today most of that content is at StackExchange, Github, Reddit, etc.
And it's not just tech searches - everyone will have their own niche which Google once got right and often returned as the very first result (when was the last time you were confident in using the 'lucky' result?), and now, not only do they not return relevant results, whatever they do return is mixed with tons of ads and (probably) paid results that aren't marked as ads.
The fact that Google doesn't yet pay dividends while the MBAs there are apparently intent on destroying the company's main product as fast as they can, doesn't bode well for their share price going forward.