What's going too far though is summed up in this line from the article:
Many more cables name diplomats’ confidential sources, from foreign legislators and military officers to human rights activists and journalists, often with a warning to Washington: “Please protect” or “Strictly protect.”
Having information to be revealed depends on having individuals willing to speak their minds. The long run trajectory for Wikileaks actions isn't a more open government. Rather it's a world where no one in any official capacity can ever speak their mind or take the risk of being open about anything. Rather, the threat of being exposed will insure that anyone acting in any official capacity will never say anything aside from the tired lines of bullshit that have been pre-approved up and down the lines of command. This is a world where no information exists that cannot be safely relayed in a press release and where people only speak their own thoughts with those in their same agency and never risk anyone outside hearing anything. The world of Wikileaks isn't a more open world, it's a black box.