I don’t know what would have happened with Jews in Arab countries in 1930-50s, I agree that their fate became worse by a connection with Israel. But look a little longer -transformation of Middle East over the century is not much related to Jews. Yes, all these countries talk about Jews and Israel all the time, but mostly to keep population entertained and angry at someone else.
So, think how Jews would feel under any of the regimes of last 50 years – socialist murderers on Syria, Iraq, Libya; Iranian islamists, Yemen civil war. How many Jews will be paraded in orange jumpsuits by ISIS? Maybe they would be OK in Egypt, Morocco, Tunis, Jordan.