There may come a day when one needs to apply for an exit visa to move from one U.S. city to another.
Actually, I echo many posters who say, too bad Hollywood, suck it up and keep paying those taxes to support those giveaway programs for the unproductive class you love so much!
For movie stars it would be a good break, their money will go twice as far in Canada. I say we ban their movies from the USofA if they make this move.