Privacy Threat in New RFID Travel Cards?
As with many other technological wonders you've exactly hit the point. Lots of privacy problems could be solved when people would be in control of when and to whom you release your sensitive information.
This doesn't mean that there are plenty of scenarios where people could be tricked to give their information, but still one can argue that it brings the discussion to a different level, namely educating people to think.
With the current state of always on identification, privacy is at an end.