yeah, sony is bound to lose a little bit. but not the groundbreaking proportions that people are claiming it to be. it'll only be a slight ripple in the pond, as ps3 users are getting the game anyway.
and anyway, isn't the point of a game to be played by gamers? let the corporations handle their strategies. its not up to us to decide what's best for them. whether you own a ps3 or a 360, all that you should really care about is playing the games. yea, be upset if a particular title isn't coming to your platform. but if it is, why the hell would you complain?