I'm reasonably confident about the preservation of our privacy (for those who are determined to keep it, at least).  As a general rule, technology currently develops at a faster pace than regulators can react to it.  They'll always be a few steps behind the cutting edge.  But it does require a fairly strong will to avoid using all those services on the regulators' leash. 

The main issue is the readiness of those who are willing to relinquish their privacy in exchange for convenience.  Once you hand it over, you may find it difficult to get it back.