Digital films suffer on two fronts, the price to own, and the space to own; which is exactly why the Apple TV 2 is a streaming only device, and why competing media centers will follow suit.

No need for a central library since services like iTunes and Amazon keep record of your rentals and purchases.

Find what you like, stream it to any of your available devices or download it for offline access. It’s an effective process, more so if pricing decreases, and they adopt a subscription model.