Sorry, slap...that's just Warden trying to make his preferred solution relevant even when it isn't. ISIS is still a relatively irregular foe, and according to Colin Gray's informative (if overly-wordy) study "Airpower for Strategic Effect" (commissioned by the Air University and Air Force Research Institute) one of the things airpower does poorly is "Apply heavy and potentially decisive pressure for conclusive strategic effect in (largely) irregular conflicts." (Gray, p. 281).