Why? License plates are meant to be public, that's why they're on the outside of cars, where anyone can see them. It's no more sinister than knowing your name and address.
Your phone number is public, but you wouldn't be happy if the lat/long of your phone during various times of the day is public, right?
I've got no real issue with being able to cover your plates while parked, but doing so doesn't do much to prevent surveillance or identification - that much is even mentioned in the article.
Anyone is able to view a license plate in a public place. Just like names on mailboxes and house numbers, it's a publicly viewable identifier, not an Orwellian form of surveillance.
http://www.radiolab.org/story/eye-sky/
Also, I don't want everyone knowing my name and address either. Why not post yours here? Or do you have something to hide?