It has long since been the time for “plausible deniability” assassinations of such men. “Natural causes” and “accidents” could wipe out a few dozen, and put a major crimp in the financing of al-Qaeda.
Since we have relatively free access to Saudi, this should have been done long ago. And US policy only prohibits the assassination of foreign “leaders”.
Do a google for "golden chain" (osama or usama) at some point. Our real enemy is the "Golden Chain", the group of wealthy Muslims who bankroll Osama. It is my opinion that Osama was primarily just the liaison between the Golden Chain and the operational people, with the job of making sure the money was spent on actual operations. The Golden Chain is the real Board of Directors of the Global Jihad.
As long as the Golden Chain can continue funding, and are themselves immune from retaliation, we will see an endless succession of new al-Queda leaders
Take away their funding, and you cripple the Global Jihad