In the end this is all academic. Whatever was the nature of the founding of the State of Israel, it is now a fact and is not going anywhere. Likewise, it is also a fact that in the territories controlled by Israel nearly half the population is Arab and it, too, is not going anywhere.
The reality is that both the Israelis and the Palestinians are operating under the same assumption: that they have the sole legitimate claim to the territory. The dream of either side of the ethnic cleansing of the territory is not going to happen. Neither will the Jews be driven into the sea nor will the Arabs be driven across the Jordan. Both sides need to accept the reality that the territory is occupied by a mixed Jewish and Arab population.
I can see only three possible solutions: 1) two states with one for the Jewish population and one for the Arab, 2) a single state with equal rights for both populations, or 3) the Swiss model of a single state as a confederation of cantons for each population. I will not opine which would be best. This needs to be worked out between the parties. But the present status quo is unjust to the Arab population and is unstable. The Israelis need to give up the idea that they can have the land without the people; and the Arabs need to give up the idea that they can go back to the status quo ante of an overwhelming Arab majority over the whole land.
Wasn't Jordan the original Arab state?