Nations that depend on oil for their economy are already almost universally terrible states. Reducing their oil income will mean they are terrible states with

Nations that depend on oil for their economy are already almost universally terrible states. Reducing their oil income will mean they are terrible states with less money to fund their terrible activities across the entire world. If Saudi Arabia runs out of oil money, the only things that will happen is their population will shrink dramatically as the vast majority of the population, who are immigrants from the rest of the world go back to the far more populous countries they come from, and they will have less money to fund Islamic terrorism across the world, and especially in Asia, probably greatly reducing whatever efficacy these organizations currently have.