Sure, and the question really came down to how much autonomy they'd end up getting within an integrated Syria. The answer turns out to be "not much".

And to make matters worse, Trump didn't even make an attempt to let them down gently - saying "the Kurds were paid tremendous amounts of money, were given oil and other things. So they were doing it for themselves more so than they were doing it for us"...

...and then, 4 weeks later, expected their Iraqi and Iranian cousins to ride to the USA's aid!