[shkkmo]

There are two different things you are conflating, the quick answer thing to the right of the search results is different from the snippet shown below the item in search and news.

The quick answer area has a different set of issues and I think there is a stronger argument to be made for it reducing click through rates (though I always click through when the quick answers my question to verify there isn't additional relevant context that is not included.)

Publishers already had the ability to block Google's indexing, image indexing, news indexing and snippet creation and even snippet length using meta headers.

It is unclear to me how this actually gives publishers any more control over how Google uses their content. It seems to have much larger impacts on smaller aggregators. It does put legal weight behind that control, but it seems to me that a much better law would have standardized these meta-headers and put the force of law behind them, perhaps creating a header that notifies crawlers that they must have a license to display snippets of text over a certain length from a site. As it is, is there any way for a publisher to automatically grant all agregators rights to display snippets of their content or does the law forcibly opt all publishers into content restrictions?