In an interesting article about withdrawal from Afghanistan is this mention of a very commonly held belief:
"One of the preeminent fears that the U.S. and other Western countries have is the possible return of an al Qaeda safe haven"
Let's look at this from another angle: suppose a new, or 10 new, organizations emerged, with names like al Mechka, al Gotcha, etc., for the purpose of disappearing the name al Qaeda. Nothing else changes, just the name.
I could write on and on about this concept, but it's not necessary: the light bulb has been lit, and the writing is on the wall.
That such a simple concept has completely escaped the great thinkers who have led this country into one invasion after the other to rid the world of al Qaeda says a whole lot about their sanity.