Don't know what you mean by 'cooldown time', but the rest is spot on. IS only gained ground because the Iraqi army is about as organized as a waste dump. Where they have encountered proper resistance(Assad, Kurds), they have crumbled. Further, the very nature of ISIS means its life expectancy is thankfully brief. They are rife with internal divisions, and their nature have isolated them from basically everyone else. Such a 'state' cannot exist for long before imploding or get rolled over by someone.
The only question is how to get rid of them with as few casaulties as possible. I am not sure what will cause the fewest deaths; crushing them militarily or waiting for them to implode.
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