Rock Band and the future of music

As album sales keep falling and the growth of downloadable singles through iTunes and others peters out, is Rock Band the future of music? It seems like a lot of acts are jumping on the bandwagon.

I'm completely addicted to Rock Band and its sequel, Rock Band 2, but I long ago played through all the songs on the discs. Thankfully, there's downloadable content (and there are Pepsi giveaways to get free downloadable content). Just this week, the Rock Band folks made available tracks by Blur, Eve 6, Blind Melon, and the Foo Fighters. Third Eye Blind just re-recorded six of their hits for the Rock Band store, and Pearl Jam will make their new album Backspacer available to download and play on September 20, the same day as the album release.

What do you think? I've certainly spent more money this year on Rock Band tracks than actual recorded music. Have you?