If every single Arab state suddenly got democracy, should we expect their foreign policy towards Israel to change?
No.
Perhaps the state funding of terrorist groups would cease, but they could still be funded privately. Perhaps active recruitment of military and police officers to train terrorists would have to go underground. Perhaps the rhetoric would be moderated somewhat (as it has been in Egypt and Jordan which are “moderate” if not democratic.)
But anti-Israelism is a popular opinion in the Arab world. How can we expect a popular elected government to do other than reflect the attitudes of their population?
Does this mean that we shouldn’t support efforts to democratize these states? No. Democracy for the Arab states is not a means to peace in the Middle East; it is a worthy end in itself. We expect wealth, education, and prosperity to follow on the heels of democracy. Years from now, in a generation or six, perhaps peace will come.