Dead Rising, but an entire city, not just a mall. Also more open and freeform (like...Oblivion. With zombies.)
Idol, go make this game! A zombies game, but open-ended like Oblivion sounds great!!!
MyD's dream game would be a open-ended fantasy single-player RPG that is very non-linear, very open-ended, and many quests would have multiple pathways to finish them. And the main quest would NOT be about saving the world, either; that might be a side quest, if anything.
Oh, and the following would have to be in the game: werewolves, zombies, dragons, ninjas, and pirates. In the game, the player could become any of those (except for a dragon), as well -- at some point in the game.
Oh, the violence and sex must be there, too. So, expect violence the likes of Dark Messiah -- or maybe worse. I want heads rolling, body parts flying; yes, the whole she-bang.
And my game would ship w/ a Toolkit, of course.