Diversify onto what? They cannot export solar energy. The Saudis are as stupid as their religion. They own nothing but sand, their oil revenues were a discovery by Americans, i.e. “Aramco,” and their continued wealth is dependent on oil wealth buying other investments, witness Abu Thalid. This is a joke. Solar will never replace crude oil, ever. “And I have made the earth livable,” —God. Paul Ehrlich comes to mind, the fool that he is in loosing the bet to Julian Simon. The greatest resource is the mind of man, created by God.
That sounds like an argument that Americans a re stupid, not Saudis.