Syria has absolutely no incentive or reason to accede to this.
Unless the Russians force it on them.
Turkey is an invading army, there to kill Syria’s Kurds and support numerous jihadi head chopper organizations.
Syria has no incentive, but probably no choice either. Assad is paying the piper for continuing his father’s policies.
So the incompetent Kerry-Obama-Clinton-MCain team not only lost in Syria but now pushed the Turks into the Russian orbit for the 1st time in their history.