Has al-Qaeda been defeated?

William McCants and William Rosenau seem to think so.

Al-Qaeda has failed utterly in its efforts to achieve one of its paramount political objectives. From the 19th century through the present day, terrorists and insurgents -- from transatlantic anarchists to Fanonists of the tiers monde to Nepalese Maoists -- have spun insurrectionist fantasies of taking over. But the Salafist-jihadists' worldwide Islamic uprising, against perceived enemies of the faith, never materialized. The Muslim masses have refused to play their part in the al-Qaeda dramaturgy. The terrorism intended to generate widespread rebellion has failed to arouse a global Muslim community. Most damningly, al-Qaeda has been irrelevant to the popular uprisings sweeping the heartland of the Muslim world. 

One of their colleagues seems to disagree. Money quote: "The group has managed to put the U.S. in a position where many of its offensive and defensive measures -- armies deployed in far-away and hostile places, travel and commerce slowed by cumbersome security theater -- do in fact make the U.S. more vulnerable by exhausting it."