The Jihad Threat "Managable"?

That's the contention of this piece on the Brookings site. Don't think I buy it. How do you "manage" 750 "No-Go" zones? How do you "manage" the radicalism of recent "reverts"? How do you "manage" "jihad is the way, sharia is the goal"? How do you "manage" all the jihad verses in the Koran? How do you "manage" the  15 to 25 percent of the world's Muslim population--180 million to 300 million people--who are "dedicated to the destruction of western civilization"?
Good luck "managing" all of that, Brookings "management"-mongers.