People will never ask their computers for directions out loud in public
Unless you're in a group, and it becomes a social activity.
Unless computers become ubiquitous commodities that represent both consumer product and fashion-like icons of social status.
Unless services such as 1-800-GOOG-411 exist.
etc, etc.
Why would that be worse than talking on a bluetooth headset in public? They do that all the time now.
I think the idea of using the prefix "I wonder..." to trigger a voice operated search engine is awesome.