I can see where this is heading. Towards the end of this generation, I expect we'll see some of the earlier 360 titles available in downloadable form (look for another overpriced HDD, maybe a 250 GB version). This would ease people into getting used to downloading newer full-sized games on consoles. Then, on the Xbox 720 launch, most launch games will be available for download day and date with their retail releases. I think this is the beginning of that transition.