Let’s see what America does.
Now that the Syrian Army has linked up with they Kurds, Syria or Russia could smuggle heavy weapons to the Kurds, to bleed the Turks.
Maybe the Turks and Jihadis are just desperate to reopen a route for ISIS leadership to escape through. If they can’t get through to Turkish territory, only the top level would be likely to get out through Saudi Arabia.
probably already gone. I suspect the finance guys that left Raqqa were from there anyway.