Here in the Netherlands we already have such law. I can't imagine how bad commercials can be with it. There is no reason except creating shock of confusion for such sound in a commercial and those things are not something you want in a car.
I got SiriusXM for Opie and Anthony, then Ant was fired like 8 months later. I kept the subscription for another year or so. Now I just have a USB stick with all my music on it, but much to my wife's displeasure i only listen to one band.
On the handful of stations my wife listens to, they play the same handful of songs over and over again. It wouldn't take a large USB stick to get better content.