The Arab allies are going to be plenty pissed if US leaves without degrading Iran. They were doing fine before the US intervened, now they are worse of than they were before.

Head hurts to think how this will play out.

The Arab allies (aka client states) thought they had a lot more influence over America than they really do; it just happened that a lot of their asks aligned with Israel's asks. When push comes to shove and America has to choose between satisfying Israeli interests or the Arab states, not both at the same time, they're going to become disappointed. Both want Iran dealt with, but I think the tension will reach a breaking point over what the final result is meant to be. Israel would love for Iran to be a failed state like Somalia, as mentioned above, with a power vacuum they can fill and huge amounts of refugees streaming out and destabilizing their neighbors. The Arab states obviously don't want that, they want Iran stabilized with a compliant predictable government. There is approximately a zero percent chance of that happening, so they're going to be sorely disappointed.