We need to flag this post, Nogbad. I hope you aren't proven wrong tomorrow.
I would suggest that, while there probably aren't too many people around (thank God) with Atta's intellect,skills, discipline, determination, connection, and hatred..(What did you call him last night, a maniac, I think? Good word)There are hundreds and hundreds of lesser maniacs in the Middle East willing to kill themselves and as many others as possible.
India and Pakistan both have the bomb, remember. So all it really takes is one.