The ancient division of the Jewish homeland into Israel and Judea was not incidental, but a built-in feature of the Jewish way of life. For Jews to maintain  principles different from the rest of the world, we must remain separate, “the people who dwell alone.” Our principles do not run contrary to pagan ethics, but rather extend them. Our principles, moreover, are not idealistic, but perfectly suited for life in the real world. Jews, therefore, do not need to isolate ourselves in monastery-like communities, but may interact with other peoples to a considerable degree. Still, too much interaction leads to cultural assimilation.

In any economy the biggest profits are generally made from dealing with faraway partners, because economic differences increase with distance, and informational efficiency (knowledge of the local market) decreases. Successful economies are open to foreign trade. With foreign trade, however, comes foreign influence: Persian and Hellenic influence then, American influence now. The economically-minded strata of Jews are always open to foreign influence. Such Jews prosper and become attractive targets: for invaders then, for economic (and therefore cultural) colonization now. Affluent, content people are not warlike, not zealous about their values, and quickly succumb to invasion or assimilation.

There is no rational reason for educated, productive Jews to stay in Israel while they can earn several times more in Gentile countries. A first generation or two of Israeli-born Jews would stay here out of habit, but habits erode quickly. American Jews similarly retained their Jewish identity for two generations after they lost Judaism, but universally assimilated in the third and fourth generations. Working for foreign markets, then working abroad, then emigrating permanently will be the trend of the next two decades.
Underproductive Jews will remain in Israel, leaving us the ultra-Orthodox Jews sponsored from abroad, black and many Sephardi Jews, and some others. Their state will be similar to Judea, a zealous poor state in the barren hills, lingering in existence for some time after Israel had gone. Like ancient Judea, the modern state will eventually become a protectorate or administrative autonomy under foreign rule.

Unless, of course, Jews heed the commandments and annex the Promised Land now.