I think it depends on the content of the demos. If they remained functional forever and served as a limited, but otherwise fully functional, slice of the game, I could see it working. Like, say, a $10 Madden that lets you play a full game, but doesn't include Franchise mode or Superstar mode, and maybe doesn't include online play. That would be a nice alternative to the full game for someone who only wants that small part of it. It really depends on how they implement this.