That does not prove that the SERPs are relevant at all.
Just because "millions" of people still use AOL does not prove that AOL is valuable. It only shows that that many people are still stupid. ;)
The thing to remember is that users do not know what they do not know. As G$ hides (prevents) numbers of important multi-page on-topic sites from the top SERPs, the user only sees the foolish one-time, one-page sites that have little relevance. The users do not even know that G$ is purposely NOT showing them the real on-topic, full websites sites. So, they do not get what really is out there to find the info they seek. They just assume that none exist. And this happens in non-commerce topics.
No, the rule to apply in understanding the useless G$ SERPs is: G$ will remove all important sites in order to force them into AdWords to make $ for G$ -- even if the site is not about commerce.
It is my hope that the new M$ will give G$ the thrashing with a splintery two-by-four on its raw flesh that G$ so absolutely deserves for their being such a traitor to their former "friends," the users and webmasters.
Then, after getting that beating it so exactly deserves, G$ should then stand up and learn from its mistakes of such evil, and thereafter choose to become an honest business, with honest SERPs. Then G$ will be able to give M$ a run for their money again.
'Till then, let M$ give it the thrashing of a lifetime. They deserve it. Let the beating begin.
But back to users, G$ goes after dishonest profits by exploiting the real FACT that users do not know what they do not know. And that's how G$ gets away with dishonest --deliberately useless-- SERPs.