It's just a cookie blocker, nothing new, people have been blocking cookies for ages.
Stupid people sit and cry that they're being tracked, causing all this fuss, when they could just block cookies like everyone else.
If it's something extra that has to be installed in the browser, most users are clueless about finding it and installing it. Unfortunately for us, Google took a page from the chapter of Android phones and added the Chrome web store that promotes stuff from inside Chrome making it easier to find.
Doubt it'll make much of an impact for now, maybe way down the road.