While this compariosn is neat, I think that video games have a lot more to worry about in terms of DRM crippling support than music does, and that is a pretty important factor to think about when comparing physical vs. digital in this kind of debate.

After all, when a song disappears from the digital marketplace, there's usually MP3s, Youtube Uploads, and P2Ps to keep it's distribution going, but digital video games don't exactly work that way.