Turkey are bound to condone it and with the Kurds clashing with US backed Iraqi gov't also it is not hard to see the US dropping the Kurds like a hot turd in order to maintain their other alliances. But maybe it doesn't matter. The US surely isn't going to bomb the Kurds and it was never going to fight with them (against the regime) so perhaps their support doesn't actually make much difference.
I mean I can see Rojava themselves dropping the Iraqi Kurds like that proverbial hot turd. It's not like they're particularly close now or have similar governments / ideologies. And they are more willing (in theory) to cooperate with Syria than Iraqi Kurdistan is willing to cooperate with Iraq.