Well i'll bite

Not sure about storylines and what not, but the game would definitely be in the rpg format. You would start off in a village, but beyond that the world is your oyster and you can do what you want, you could lead a simple life within the village. You could train yourself in smithing and make a living as that. You could go out into the world and become a king, or a king's champion, a simple soldier... the list is endless, that would be my dream game, an actual life from the beginning and shaping yourself into whatever the hell you can think of being, rich, poor, sociable, a hermit, WHATEVER you want, it'd be great... it would also take an ungodly amount of time to create, and take stupid amounts of pc space, but by god it'd be the only game i ever play again.