IMO, the crux of Mr. Saletan's commentary is that he wants the United States to center its efforts on terrorist groups and their leaders rather than individuals.
By my reading, Saletan thinks that striking the wolves in their lairs is a more efficacious approach than attacking their shadows and their followers.
In
some respects, Mr. Saletan's approach to GWOT is similar to the view Bush the Younger articulated in his 2006 speech to the general assembly of the United Nations. A transcript of that speech is available
here. (Among the key differences would be Mr. Saletan's views on detaining and interrogating terrorists and suspected terrorists.)
FWIW, Mr. Saletan is a professional journalist, not an academician.