It already has we were just unwilling to admit it.
@EdinVA Too broken to fix,so pulling out the troops seems like half of what we need to do at this point.
The OTHER half of "what we need to do" is to get serious about taking out the leadership every time we find one,anywhere we find one. Play "Whack a Mole" every time a new leader pops up,pop caps on his ass.
AND......,if you REALLY want to stop it from returning,start popping caps on the money boys that finance them,where you find them,when you find them,regardless of who they are. Track them down and just "disappear them" if in a country we can't get away with publicly killing them in. If asked,say something like "Gee,I was kinda wondering what happened to him myself! Let me know if you find him,ok?"
NO SAFE REFUGE ANYWHERE IN THE WORLD for terrorist financiers and/or enablers.
An old saying from my-era Army comes to mind,"If you are going to be a bull,be a Brahma."