That was what Russia thought about Ukraine. Effectively, they needed East European tanks and munitions for the first two years, but munitions production ramped up, and now they produce more per year that what they received over two years. A resource-rich country like the Iran that is effectively fight a death war (that's the controlling party belief) can keep up a very long time. The fact that the US tried to get the Kurds and the Baloch/Sistanni involved show that they are well aware that the way out is through a permanent civil war and the country fracturation. And imho, while Kurds accepting to be betrayed by the US for the third time in less than two decade won't have any real long term impact, an independent Baluchistan can easily destabilise Pakistan. Also, that would be a third country in the area in which the Hanafi jurisprudence is pushing hard towards Deobandi/Salafi, and personally I'd rather have any Shi'a school than that.