They get off their duffs alright, when their population numbers have grown enough within a society. Saudi Arabia is not the only country that sponsers islamic terrorism. Look at Lebenon, that was Iran and Syria sponsered. Lets not forget all the money that Lybia and Egypt also throw into the mix, and all those wonderful islamic charities.
You take Saudi money out of the mix(which I think that we are in the process of doing), and an other power hungry islamic group just fill the spot. It is the call of the religion not just one sect of the religion.