Natasha Singer, reporting for the NYT:

“If we do away with this relevant advertising, we are going to make the Internet less diverse, less economically successful, and frankly, less interesting,” says Mike Zaneis, the general counsel for the Interactive Advertising Bureau, an industry group.

John Gruber put it best

Utter and complete bullshit. TV doesn’t track you, and with a few exceptions like HBO, it’s completely advertising driven. Print media doesn’t track you, and it’s been primarily advertising-driven for centuries.