There is nothing "untenable" about Israel's policy. In fact, it has been an amazingly successful policy since the earliest Zionist activities at the end of the 19th century. As a state, Israel has pulled off bona fide miracles: defeating armies five times the size of its IDF; integrating and rehabilitating a refugee population (c. 750,000 Jews driven from Arab countries between 1949 and 1954) larger than the population of Israel at the time; draining swamps and making the desert bloom; creating the second most successful hi-tech industrial complex in the world (second only to the USA); and creating the only functioning democracy in the entire Middle East, in which the Arab citizens of Israel have five political parties (four more than they can vote for in any Arab state in the entire world) and twelve members of Parliament.