About the privacy thing - like Somenbjorn says, Facebook - Google - and I don't know what other shit, already took all of our data. So yeah, I do not have a problem with that. Well I kinda do, but that's the challenge of our time I think, to keep our own privacy in a world without privacy.
Will it change something if a few of us don't upgrade? - No.
Windows is a too largely used OS to withhold the change on an individual base. But that's my opinion, if you don't share it, it's ok. If you don't like it, it's ok
