Being that we should probably expect 2 to 4 times as much texture and geometry data on high-end next generation games as we see on current HD console games, I don’t think there ever was much doubt that we would see an end to DVD as the primary media format for any next generation console. While I think this might mean all manufacturers will use Blu-Ray or a derivative format, it is entirely possible that another format could be chosen; and one possibility is a memory based format being that you could (probably) deliver a game on a 4GB/8GB flash-card today and flash memory capacity follows Moore’s law (meaning that by the time the consoles launch an 8GB/16GB card would be possible, and by the end of the generation 64GB/128GB cards would probably be available)