...before Google backs down in the face of withering Congressional criticism and media backlash and allows consumers to opt-out of its plan to follow the activities of users across YouTube, Gmail and search.
When this happens, this won’t represent a major defeat for Google. The American public gets steamed about not being given choices. Once given a privacy choice, only a minority will bother to exercise it.
Besides, when we get depressed about privacy, Google/YouTube can always entertain us.
Further Reading: Google Widens it Tracks - The Wall Street Journal