But what's to stop G or Y from displaying the entire cache of your site, rather than a snippet? You might still get traffic because the person would navigate deeper in, so could you afford to tell them no? If you tell them no, wouldn't there be someone next in line who would be willing to step up?
I don't mean this against you EFV, but why do half the people here screaming bloody murder against scraper sites, when they get most of their traffic from what basically amount to giant scaper sites? How much would they be willing to let SEs "scrape"?
How much is any site willing to give up to a search engine? A snippet now, a whole page later? All for the privledge of being front and center to a person looking because it is now the only way a person looks. This is the point he is making.
You obviously have made traffic plans beyond the SEs. There are plenty who have not. It is an old subject, explored many times, mostly after a devestaing G update. He just adds that they now have the power to go ahead with something like this, so people should keep this in the back of their head.