Kahane's article is clearly on target. What the founders of Israel (from Theodore Herzl on up) envisioned was a homeland for the world's Jews, which was also a democracy. Kahane clearly points out that in a democracy, the majority rules. And as long as Jews are the majority, Israel will be a Jewish state. Not one day longer.
The choices, however, are not clear nor easy. Can the Arabs within Israel be denied the right to serve in the Knesset? With such a rule, the Jewish aspect of Israel can remain in place. But what happens when the pressure of a growing Arab majority demands equality against a Jewish minority (witness the black-white situation in the Republic of South Africa)?