I wonder if kids growing up with games like Guitar Hero will expect a new and different form of written music when they come to learn real instruments. Maybe the "roadway" real-time view might come to replace traditional sheet music entirely for some instruments. Instead of sitting down with a paper book, you'd sit with an iPad or a computer screen to display the notes and timing.
Mokalus of Borg
PS - Then again, displaying real, full musical scores like that might be a bit much.
PPS - Someone has probably already tried.