On the other hand when you are filming something do you really have a scene in a film that is longer than 30 minutes? Realistically your scenes are much shorter so the utility of having a camera that could shoot longer is probably low.
Say a concert? (I don't know anything about cameras, I was just thinking about that same thing and realised there are probably some uses for scenes longer than 30 minutes.)
That would not only get them off the hook but also encourage their customers to abolish this ridiculous law.