I also doubt it , but even if it was not planned and built as flypaper , it can be flypaper now.
Turkey is very key .
The Turkish border is a conduit for reinforcements and oil running both ways .
The Turkish government and military are not accustomed yet to co-operation with Kurdish soldiers.
If a deal is cut with the Kurds and Turks , if the Turks close their border, if the Kurds and Turks press their advantageous position and greater numbers, if the US serves as the air arm and artillery and supplier, this could be the war that breaks the Isis back and discourages repeats for a generation.
Perhaps it would not even take long, depends a lot on how completely they can be cut off.
Nothing is going to produce a happy Syria, but a happy Kurdistan allied with NATO is possible.