If you ask me, they should make it illegal to have a sign that's not registered, and tear down any that remain unregistered a month later. They've had six years to get their ducks in a row, so I have no sympathy if they can't get it done in a month. There needs to be an economic disincentive to not registering them in addition to registering them or it'll never get done.

Check out http://illegalsigns.ca/ for a toronto-based movement that's had a surprising amount of success in eliminating illegal billboards.

Frankly, comparing it to a game where the choice is (Play Guitar Track) or (Don't play guitar track) seems silly. This is much more a game that is trying to get you to think about composing music, and seeing the ways different sounds work when combined. It has an entirely different reason for existing than a symphony orchestra playing Beethoven.

Much like I would never compare Wii Fit to running a mile every day, I wouldn't compare Wii Music (or any other rhythm game) to playing music; think of them as a way to expand your thinking, and to perhaps add more breadth to the things you care about. It's sharpening the saw in game form, basically.