Have you read the comparison between "Firepower" of Israel and Iran? While it's not the full story and doesn't give a final result how strong both alliances really are (conventionally), Iran is not the "little guy". Unfortunately.
If it escalates, it requires tough ressources to overcome Irans regime, with as many of the worlds nations for rejecting US/UK imperialism claims from Arab community. Then this opens doors for Russia, China, NK, well well.