Clint Watts of FPRI has a commentary, the full title being 'The U.S. Can’t Destroy ISIS, Only ISIS Can Destroy ISIS – The Unfortunate Merits of the “Let Them Rot” Strategy' and draws upon the Algerian 'lessons learnt':http://www.fpri.org/geopoliticus/201...-rot-strategy#

Given the hype in the media, some of which surely comes from within governments, I hazard that patience and following such an option is overwhelmed by those who advocate "tough action" and defeating ISIS. As if 'shock & awe' works against an insurgency.