In truth, I don't see how the Arabs could beat Israel in that they destroy it and set up a pan-Arab state, but frankly everything that could go possibly wrong for the Arabs during that war did go wrong. What if the Israelis had not launched their pre-emptive attack but instead the Arabs had attacked first? Or rather, could the Arabs have detected the pre-emptive strike and countered it?
Also, what could be the implications of a different outcome of a Arab-Israeli war where the Arab forces are more successful?