Nutshell: Brin argues (fairly successfully IMO) that we will have no privacy in our future, no matter what steps we take now. He suggests that we do have a choice in what kind of society our world will become - one where everybody has the right to snoop on everybody else, or a world where only the powerful have the right to snoop on each other and the little people, without fear of retribution.
I'm not going to reproduce the entire book, but if it wrankles your nose reading that former paragraph, and you haven't read the book, then go out and read it. If you've read it, and disagree with it, I'd like to hear why - he's got some fairly bulletproof reasoning behind his statements.