Don't know if it's the end for them.
The Kurds are pretty damned tough, which is largely why the US military and the State Department were willing to work with them in fighting ISIS. The Kurdish group in northern Syria is extremely radical, with kind of a mix of anarchist, socialist and nationalist ideologies, and it's remarkable that a basically status quo power like the US has been willing to ally with them at all.
It's not surprising to me that Trump is now pulling out of the arrangement, because I think the US government has basically been trying to use the Kurds, not support them for their own sake. If Trump hadn't been the one to betray them to the Turks, I think another US president might have done it.
Now that Trump has canceled US military support, it's likely that huge numbers of the Kurdish fighters who helped our country in combating ISIS are going to die. They face a really hard future.
But will they all die? I think historically, the Kurds have showed a remarkable ability to endure defeats & betrayals and bounce back to fight again. I don't know enough to say that they can do it again this time - but I wouldn't count them out for the indefinite future. I do think Trump has basically thrown a feisty US ally to the wolves.
-- democratic socialist