Saudi Arabia may go broke.

[Oberon]

Depends on the oil prices I suppose. I mean Saudi Arabia is deliberately keeping oil prices low at the moment to screw over Iran, and hoping to ride out the losses by the currency reserves they've built up over the years.
So I imagine before they run out they'll jack the oil prices back up again, either that or someone will do something stupid in the Middle East and they'll rise up again.

Either that or they'll get even more feudal and go North Korean. Which will be...interesting...