<<But how does a single state solution occur? You might sell it to the PLO, but selling it to the Zionists is likely to be a very hard sell.>>
This factor is discussed from time to time in the MSM, under the general heading of "The Demographic Time Bomb," i.e. the natural growth rate of the Israeli Arab population outpacing that of the Israeli Jewish population. The general consensus seems to be that the Jews will attempt to maintain their dominance by cutting back on the "one-person-one-vote" principle and as required the human rights principle as well, resulting in a more and more South-African-style apartheid state which will eventually collapse under internal opposition and international condemnation, much as the original model did.
The Zionists are well aware of the problem. In areas of Israel most "endangered" by the growing Israeli Arab population, they are trying to encourage settlement by ultra-Orthodox Jews, whose religion bans contraception in favour of the Biblical injunction to "be fruitful and multiply." This is kind of a two-edged sword, because the Israeli elites are pretty much secular and these bearded fruitcakes and their wrapped-up women can be a bigger problem for them than the Arabs, if given enough time to grow in sufficient numbers. Already in certain parts of Jerusalem, they are throwing human shit at women who dress "immodestly" or otherwise provoke their ire. It kind of reminds me of The Cat, The Mice and The Cheese children's story.