An independent Kurdistan is the best bet to contain ISIS
While concerns of a terrorist resurgence in Afghanistan are front and center, we need to remember that there are thousands of ISIS fighters waging a low-level insurgency in Iraq and Syria. Containing that threat is critical, and doing so over the long term requires an international relations moonshot: creating an independent Kurdish state.
Based on past efforts to create an independent Kurdistan, it would seem unlikely and Iraq, Iran, Turkey, Syria and Russia would oppose such a move. However, the status quo is untenable, and no other solution likely would be as effective and durable in containing the terrorist threat in the region.