License plate cameras are one of the nastier elements of the surveillance state. There are already major cities and areas where it's impossible to drive without the government noting all of your movements. I don't expect a Supreme Court challenge to defeat it, either -- the three liberals will probably support surveillance in general, the three hard-right conservatives and Roberts are pro-police, and that's seven votes already.
OTOH, I do hope they'd at least help defeat any challenge to this program which, by tracking all the cameras, at least gives people some chance of not having their every action recorded.
And if people happen to use this information as a map of cameras that could have obstacles placed in front of them or otherwise made useless, well, not a huge tragedy.