Is the result of an even more rushed British departure, an early Israel and Arab-Israeli war? Is Israel more likely to be wiped out? Or would it do better? Why so?
Illegal immigration and arming accelerated to boost the Zionist Yishuv after the war, although the base of leadership and infrastructure was still pre-war migrants. At the same time, I don't know what the schedule of recruiting and training and equipping of the armies of Syria, Lebanon, Egypt, Tranjordan and Iraq were, and if they had grown in relative strength and capability by '48 compared with what they had and and could do in late '45, 46 or 47.
Also, the French did not quit Syria until sometime in 1946, so I don't know if Syrian or Lebanese intervention against the nascent Israelis, as occurred in 1948, is plausible if there are still French forces contesting control of Beirut and Damascus.