i think it's more complex than that. authors aren't patent trolls. many spend years upon years creating their work and the fact that they own the work they create puts them at ease and allows them to focus solely on their work. To know that they have control of their work is really necessary support for creating the best environment for authors.
i'm not talking about publishing companies either. An individual author should be able to opt out of being scanned by corporations, whether it benefits him or not, whether it increases his sales or not. That really is his choice. The individual author has a choice to DECREASE sales of his work if he chooses. After all, that is his product that he personally created.
The four factors of fair use (each of which the judge discusses for this case) help balance the rights of the "Authors and Inventors" against the public's, but it's important to always remember that the primary purpose of copyright is advancing the public good.
Now does this really benefit people or not is another question. I think it does. Do you think it does not?
Just like full-text search, now.
As was said by a sibling comment to yours, people do this all the time in bookstores too.
Corollary: Google shows a snippet of text from a website under their link. If what I wanted to find out is contained in that snippet, I won't necessarily click the link. Same thing, but instead of a pointer to a website (which, in this example, just lost a pageview), it's a pointer to an book that you can purchase.
More funnels to conversion mean more books purchased.