The problem is that the government gets to decide what's super secret and what's not, so you'll get a gradual erosion of information as more and more stuff gets marked as secret, even when it's just embarrassing or difficult to handle.

A similar thing happens with FOI requests here in Australia - there's an exemption for material which is 'commercial in-confidence'. Now pretty much everything that the government produces is marked as commercial in-confidence, and it's back to the old system of suing the government to release information.

Far better to have people leak stuff and then be protected under whistleblower / freedom of the press laws if it's in the public interest (with presumption that it is in the public interest, so the government has to bring a case to prove that it's not).