Not sure if someone has suggested this yet, but my idea for a great video game would be a zelda game, that let you play as link/gannon/even zelda, against other people in a PvP format. It would be kinda like games such as COD or Halo, featuring maps from the game, as well as online multiplayer. I'm sure Nintendo could come up with an interesting leveling up system, similar to that of COD 4. It would also be a good idea if Nintendo somehow integrated Twilight Princess and your achievements there to what weapons and armor you could wear in this game. Just a rough idea, but one for what I think would be an extremely popular game.