Kuwait despite its size has been the fulcrum of western power projection in the region since the British empire. It did not run out of interceptors because the US did not run out of interceptors. By all accounts the latter seemed very close by the time the MOU was signed.
Re. PMF, the USAF has not proven effective against guerilla forces historically, see Vietnam, Afghanistan, Yemen. PMF have a direct land line to Iran which makes them even more resilient and potent. However, here are complicating factors like Muqtada for example. None of this will be easy. The path to becoming a superpower usually is not easy. That is expected. Let's remember the KC-135s that were targeted over Iraq presumably by the PMF. Or the Kuwaiti F16 pilot shooting down the USAF F15s.
The Houthis became steadily more powerful under USAF and SA aerial bombings. That's why attiring Iran to the point of eliminating their control over the Hormuz doesn't seem realistic. Geography heavily favors Iran and all they need to do is keep firing drones at tankers.
As far as Arab tendencies, this has been the case since the Babylonian semites. But Iranians managed to control it in the past. A shared religion maybe a catalyst this time.
US will not run out of oil, but will lose influence to Iran once all or some Asian countries come begging to Iran to get their fuel, "cooking gas" and fertilizer.
We don't know much about Khamenei Jr. at all. It is yet to be seen if he will consolidate power. A lot hinges on the quality of leadership at times like this. Can he, will he reign in the reformists? We shall see.
