The weight of the global market and giant corporations has been thrown behind transnationalism and globalism. Political and legal multiculturalism and postnationalism complete and extend the work that the economy is already doing. Transnational may be oppressive and unworkable, but it isn't unprecedented and doesn't come from nowhere.
There's also an ambiguity in "liberal democracy." Fonte's is the 19th century version of these ideas: a self-governing, sovereign state for every people. The "liberal democrats" or "Liberal Democrats" of the 20th and 21st century have left such ideas behind them already.
Certainly since the founding of the European Union and the United Nations, if not the League of Nations, liberal democrats have been on the transnational path. Proclaiming the benefits of liberal democracy today probably means promoting post-sovereignty. Today's advocates of 19th century liberal democracy or republicanism, like Paul Gottfried, are radically at odds with promoters of the modern version.
This article and William Hawkins National Review article on Kantian Europe have some overlap. Hawkins is wrong about Europe representing some Kantian universalism against American particularism. Years ago one might have taken exactly the opposite line. We were the freetraders, the universalists, the ones who wanted to get Europe out of its particularistic ruts. But he does point out the universalizing drive of the modern world.
Finally, it's not clear how far Israeli "post-Zionism" fits into the pattern. There's a surface similarity between phenomena here and there. But one could argue that things are actually quite different.
First, the kind of transformation urged on Israel may be of the sort that we went through a century ago, when we ceased to be an overwhelmingly WASP nation. Or a century before that when we separated church and state.
Second, post-Zionism looks like a continuation of the transformation away from the original Eastern European settlement to take in Jews from other parts of the world. There's a similarity here to our own history which used previous waves of immigration to justify later ones, but it makes "post-Zionism" less unprecedented or apocalyptic. Such a "continuation" or further development may derail the orginal project, but it ought not be taken as something wholly alien to it.
Third, The vision of some early Zionists was already multicultural. It was far more problematic to plant a state for one people in a region largely populated by others than to advocate one for a population living in the area where the state would be, so compromises with sovereigntism were necessary. For some early Zionists, a national home did not mean a nation state. For others, the assumption was that Arabs would gratefully live in and embrace a modern industrialized Jewish-run state. These may be naive assumptions, but the question of what the original Zionist project of a "national home," a "Jewish state" or "normalization" involves means that Fonte opens up a complicated can of worms that he probably should have left alone.
Fourth, it's not the desire to integrate Palestinians that makes "post-Zionism" but the arrival of non-Arab and non-Jewish workers for economic reasons. As with other countries, the economic and demographical transformation precedes the political one. Even fervid Zionists are going to find it difficult to cope with transformations in Israeli society, and it's by no means clear to outsiders that those changes are for the worst.
Peres's vision of multinational organizations for the Middle East is almost certainly naive and unworkable, but should be seen in the positive light of the original Franco-German moves to overcome centuries of conflict, rather than as a pernicious move in the direction of a superstate.
I think Fonte's point is that the term "liberal democrat" no longer applies to those who claim it in U.S. politics. They are more accurately called "transnational progressives." It was FDR and the New Dealers who slyly and deceptively appropriated the term "liberal." Their ideological trans- and supra-national progeny should be stripped of it.