All that shows is that they HAVE a superior bargaining position.. you didn't need to show that. Anyone would admit that Sony the megacorporation has vastly superior bargaining power over Joe Gamerdude.
Having the superior bargaining power doesn't mean, all by itself, that Sony isn't allowed to require new Terms of Service in order to use PSN. They have to trick you into something unfair. Only problem is, (1) they're not tricking you, and (2) it's not unfair.
Since they're warning you right up front about the new requirement, they're not tricking you.
Since they openly tell you that you DON'T HAVE TO AGREE to the new requirement, it's not unfair.
â"Legal.Troll (yay, this is the one post per day that I'm allowed to make!)