Great post, Dutch. But in simpler terms, the Kurds are in it for Kurdish nationality purposes, not to be our legmen or stooges, not to eradicate ISIS wherever it may be, and notwithstanding the contrary desires by any of the other players like the governments of Turkey, Syria, Iran, Iraq, or Russia.
The whole paralysis and or panicked shrieking induced by the mention of 'Boots on the ground' by both of our parties is a barrier to ever beating ISIS. No amount of SOCOM raids, proxy soldiers, infrequent and over-controlled air attacks with the most restrictive ROE possible, and drone strikes that occasionally kill someone important (Just promotion opportunities for the next tier, really), are going to actually knock off ISIS. It will ultimately take some admixture of modern Western or Russian ground forces alongside the locals to stiffen and lead those locals in full-strength combat operations to boot ISIS out. I don't think the West has the balls for it. I don't know if the Russians are smart enough for it.