Everyone at some point has had a Windows machine, including the privacy-conscious and the paranoid -- simply because, at the time, there was no realistic alternative. Once you reach 90% penetration, any special-interest group with a pet complaint will be sizeable.

That's not happened with Chromebooks and it's unlikely to ever happen. Privacy-conscious users now have NSA-hardened Linux and "won't-let-FBI-in" iPhones, they will never have to deal with Google if they don't want to. They are not forced to use any of their services, since there are alternatives for pretty much everything -- even superior ones, in most cases. The only service that used to be unmatched was Search, and sure enough, plenty of people still complain about tracking searches.