I think as more and more devices emulate each other in terms of audio, video playback, internet access, communications, etc, the line between game console, cell phone, PC, will vanish as every unit essentially does everything with different sizes and slightly different capabilities in each field (cell phones will stay small and not be able to play as complex games, but will get graphics uogrades).
I don't think DVD will die soon.
BitTorrent, NetFlix, and legal downloadable movies will replace most of the demand for movie rental stores. They will stay open for videophiles as a high-end market (don't want to download SUPARHIGHDEFCONTENT) simultaneously with old people that don't understand movie downloading, but eventually decline and die out.