Actually, they did have several Turbo CD games on Wii's Virtual Console like "Castlevania Rondo of Blood." (Though, they're listed under "TurboGraf-X" games on the Wii Shop Channel.) So emulating disc games isn't impossible on Nintendo consoles. So Sonic CD isn't too impossible especially, sense it's a 2D game. It'd be cool if they included both soundtracks for the game.