The USA and Israel could always win the war, at any time, by playing the "destroy all your power plants and fuel facilities" card. They've been sitting on this card the entire time.
They don't want to play it, because it would cause near permanent economic damage to Iran. It is not possible to run a modern economy without fuel or electricity.
Without fuel, there are no logistics; there is no capability to transport an army. Nor is there an ability to transport food; it would cause an enormous civilian crisis, and this would cause massive riots.
Iran (and most of this thread) does not understand this, and that's why there were kindly encouraged by Pakistan and China to go to the negotiating table, before this conflict gets worse.
[dead]
Iran can still escalate too. Past a certain point we really have to examine what "winning" means if regime change is only feasible via mass starvation.