I agree that would be cool! I actually worked on the earlier version of that as my master's thesis[1]. I think it would be cool to do this in a less controlled environment where the track isn't necessarily preprogrammed. (Currently there is a camera with IR filter above track and an IR light.)

[1] https://www.youtube.com/watch?v=v-oikffGxOo&nohtml5=False

That's the coolest thing I saw all week! A track like that was the first thing I built all by myself when I was a kid.