I think that there are no populations in the world who would give way to IS like they did in Iraq and Syria. IS is in consolidation and fortification mode. They know that the full weight of the ISF and Peshmerga backed by air power are going to come down on them in Mosul and they need to be prepared. The end of February is going to start a very bloody chapter of this conflict.
Edit: Don't confuse their inability to expand as an inability to grow though.
Edited by ethanm - 1/7/15 at 3:18pm