Ehh without a massive foreign intervention in 48 there's about a 99 percent chance of complete ethnic cleansing at best or Rwandan style rapid brutal genocide at worst if the Arab armies completely win. Without a much earlier POD their really isn't any likely hood that the Jewish population is allowed to remain/allowed to remain alive.
And since nobody was stupid enough to get sucked into the quagmire that Palestine was at the time that means genocide and ethnic cleansing.
I disagree,
especially with the "Rwandan style rapid brutal genocide" thing. Why?
1, Arabs aren't some evil rapist monsters.
2, even if things DID degenerate to such a situation, which I find extremely unlikely, the USA not 3 years ago finished beating the shit out of an evil fascist regime that tried to exterminate Jews. What do you think their response will be to even a hint of someone attempting to exterminate a bunch of Jews?
More likely, one of two things happens: The US steps in and mandates that the Jewish forces sit down, shut the Hell up, and let the Arab majority run the damn useless marshland; or, the Soviets make flexing motions and the US doesn't have enough nukes ready to deploy yet, so the US evacs the Jewish civilian population and says "hey, we're, uh, ending immigration quotas for Jews, come here and you're all cool with us, OK?"