For real, we NEED some kind of Wario & Waluigi game. Maybe some GTA-like game where we play as them, robbing stuff around the Mushroom Kingdom while Mario, Luigi, Toad and Peach are away, going on some adventures (How about making the game's beginning be an exact replica of another Mario game, and when they leave, we (as the player) just don't follow them and see Wario and Waluigi, that could be an easter egg toward another mario game)