What other worlds are left for Apple to conquer? Where else in your life can you possibly put an Apple product?
On top of your television? Maybe. The AppleTV is actually a damn good product, but it still hasn't gained much traction. Many folks still aren't quite sure what it does. Heck, I've used one and I'm still not quite sure what it does. I know what it won't do, though, and that's play my DVD collection.
Games consoles? I'm doubtful -- Apple's strength is in making better user interfaces than everyone else, but when you play a game you're at the mercy of the third party developer's interface. (And yes, they already failed at this once).