Well, in case you haven't read already, Nintendo's Animal Forest for the Gamecube is going to have an actual full NES Emulator on it, along with 10 original NES games. If Nintendo is willing to put an actual full-fledged emu on a Gamecube game, who knows, maybe the original Metroid will be available on the Gamecube as an emu-extra one day.

(Gamespot Article Here)