One can argue whether the privacy provisions were weakened or not. In the case of the WikiLeaks, Twila Brase, president of the Citizens' Council for Health Freedom, got to the heart of the matter when she said, "What WikiLeaks shows you is how security information is all about the integrity of individuals."
The bottom line is that someone in the State Dept. leaked the documents. No iron-clad privacy provision in the world can protect against a person leaking information - whether it's paper based or computerized. Brase went on to say, "Once you get information on any kind of electronic format, it is very easy to take it, to access it, to share it, to download it."