The campaign against ISIS is making significant progress. The end is in sight for the Islamic State. But its demise will not necessarily produce a lasting victory over terrorism. Unless the U.S. takes the lead in stabilizing Iraq and Syria, the territory that ISIS loses may simply be taken by other extremist groups, both Shiite and Sunni. To prevent continued violence and instability, the U.S. should push to oust Bashar Assad in Syria and to recognize the rights of Sunnis in Iraq. Otherwise we may well see ISIS 2.0 emerging out of the ruins of the Islamic State.