Assuming that McDonald comes out the way everyone thinks it will... has there ever been a case where a more widespread set of laws will suddenly become illegal?
There are a couple of states, and probably hundreds if not thousands of local jurisdictions which will soon find themselves to varying degrees on the wrong side of McDonald. Will most of them take the DC route and re-write their laws to be as difficult as they think they can get by with, or will they do nothing and wait to be sued, or will they do the smart (and cheaper) thing and just repeal or fix their illegal laws as soon as they can?
It's going to be a nation-wide "popcorn" event.
Someone needs to set up a website to keep track of it all!