Those are good points. I'd probably respond by saying: Government secrecy has always been weakened by potential leakers, etc., so I think the main difference

Those are good points. I'd probably respond by saying: Government secrecy has always been weakened by potential leakers, etc., so I think the main difference here is that Wikileaks' technology has provided a buffer to allow journalists to write about things they had previously been afraid to write about. As a corollary, an organization of a particular size can only obtain a finite amount of secrecy. When the organization's size is > 5 people, the amount of secrecy is quite low and has always been so.