Northern Syria is Arab land and will remain as such. No amount of Kurdish terrorists will change that. They are being dealt with currently by Syrian Arabs (whether the Syrian opposition or the Syrian Arab Army) and will be dealt with until they will no longer create problems for Syria. In any case it is a question of time before that region will be flooded by Syrian Arabs and the Kurds will be outbreed very easily. Which is even happening in the imaginary Barzanistan in Northern Iraq.
Some imaginary Erdogan dreams (if he and his supporters have such silly ideas) of annexing that land will remain as such too.
If not for Syria being in turmoil for almost 10 years, those Kurds would have been dealt with by just a few Arab clans alone. Like always throughout recorded history ever since they migrated to Arab lands.
It seems that most of the ground fighting is done by local Syrian Arabs. I hope that they capture every anti-Arab Kurd terrorist and put a pullet in their heads of those stateless trouble makers.