I can not imagine what will happen in the gulf region if global demand for oil starts going down.
i imagine war,chaos and a re-ordering of nation boundaries is going to be the inevitable result of the decline of oil.
Many gulf countries rely on foreign labor for “ work locals aren’t willing to do”. They can drastically cut back on that and reduce the local pop by half or more in some cases.
Might not require wars to be fought, but might still mean borders get redrawn in the gulf region when the economics shift.