In answer to LUHE's question, Dabiq is north of Aleppo not far from the Turkish border. The "Sunni militants" in that area are, as I understand it, Turkish proxys trying to prevent 2 Kurdish regions linking up. It would be more accurate to describe them as "foreign backed militants who happen to be predominantly Sunni". Much of the actual fighting to remove ISIS from that region was done by Kurds (who are also Sunni).
ISIS lost Dabiq months ago, by the way. But yes, it's loss would mean that ISIS can't be the caliphate that was prophesied.