One should not expect any change to come from the U.S. government itself (which includes Congress), whose strategy in such cases is to enact the pretext of “reform” so as to placate public anger, protect the system from any serious weakening, and allow President Obama to go before the country and the world and give a pretty speech about how the U.S. heard their anger and re-calibrated the balance between privacy and security. Any new law that comes from the radically corrupted political class in DC will either be largely empty, or worse. The purpose will be to shield the NSA from real reform.
There are, though, numerous other avenues with the real potential to engender serious limits on the NSA’s surveillance powers, including the self-interested though genuine panic of the U.S. tech industry over how surveillance will impede their future business prospects, the efforts of other countries to undermine U.S. hegemony over the internet, the newfound emphasis on privacy protections from internet companies worldwide, and, most of all, the increasing use of encryption technology by users around the world that poses genuine obstacles to state surveillance. Those are all far, far more promising avenues than any bill Barack Obama, Dianne Feinstein and Saxby Chambliss will let Congress cough up.