Some reality check first. It is completely unthinkable to have a major country that has no state secrets and whose information is completely free and open for anyone interested. By "major country" I mean one that has geopolitical standing and ambitions. A country that is completely open, information-wise, if such exists, is an irrelevant entity -- a satellite in the orbit of one of the major players.
Sorry if you don't like the reality. Reality has the interesting property to exist regardless of whether we like it, or even whether we believe in it. The reality is that the political world is not, and cannot be, a single entity ruled by mutual trust and eternal love. The political world is divided into hostile blocks. Even if our block falls down (due to, among other reasons, too much assangeness), the blocks will not disappear, they will reshape. China has enough vitality as far as I can tell. Surely the chikoms would not mind all US secrets being published openly. Surely they can fill in the geopolitical void left by the US (hypothetically speaking).
Of course, there is a flip side to that. The government secret agencies tend to do nasty things behind the veil of secrecy and in that sense it is a good thing to have civil control over them. However, that does not alter one bit the fact that it is impossible to be a successful geopolitical player that reveals **all** her secrets.
J. Assange took an active part in a war. He may not realise that but he did. Now he whines that the party he damaged is trying to destroy him :) Welcome to the real world, idiot! Every major player will do the same. Try hurting Russia or China or Turkey or Israel and see what happens. The sissies from the Western shelter have become accustomed to the idea you can hurt the state with impunity. Well, that's only possible in a small part of the world. Only inside the shelter that protects from the brutal reality. And is possible only to a certain degree. If too much assangeness happens, either the state will find means of protecting itself from the cancer, or will be overrun by a hostile party that allows no assangeness :)