Fifteen European nations have surrendered much of their sovereignty. No one even talks about the American nation. Krauthammer provided an answer a couple of years ago in a New Republic symposium marking the centenary of the Zionist movement. They may even, for a time, lose their independence. But they cannot disappear.
Small nations can.
Israel is a small nation. That is the reason post-Zionism is so dangerous. To do so when the danger is at the gate is suicide. What he says about small nations is true. But he fails to mention that, unlike other small nations, Israel can call on the services of the greatest power in the world.