You can play the slippery slope card all you want, and try to apply what we're seeing to all other applications, but I don't see anything to back it up.
Regarding remote wipe. I have no idea if that's in the iBookstore EULA, and haven't found a thing about it. My guess is like apps, you'll have to confirm and download the update yourself. In fact, when apps are taken off the app store, you still get to keep them, whereas Android apps have a kill switch. Have you seen anything that implies remote wipe capabilities?