That's interesting, I never thought how TPP would endanger sovereignty. From what I understand TPP ties together all the largest corporations of the world by setting ground rules they can agree to operate on. Corporations need these rules to be accepted by countries all over the world, the one commentator's remark that japan would be 'colonized' is a good descriptor of the effect.
Nothing will stop TPP or whatever variant, countries really don't have a choice, they're just in debt as the banks. Hooray multiculturalism!