Seriously though, having your mascot on the opposing system has already been done. All through the nineties the ongoing joke was a sonic game on a nintendo system. It seemed like such an impossible thing, since nintendo and sega were mortal enemies. Now it seems natural that nintendo systems get subpar sonic games.
Do we really WANT the original halo for the ps3? Even with improved graphics and gameplay I probably would not buy a ps3 for that. Now if square would finally upgrade and release FF7 for the ps3, I WOULD buy a ps3, just for that game.