And if you remove the friendly marketing speak:
"Can I still play ROCK BAND if I've already downloaded it?"
We've squeezed as much money out of you as we think we can on this one so now we're switching off your access to that thing you thought you owned because we can. Yes, we know we could've built it so it could run without one of our servers but where's the fun in that! Hahaha. Now bend over and give us more money for our latest half-finished bug-riddled product that we might choose to cut you off from at any time.