Check the resource curse on Wikipedia, regarding other oil countries. Tl;dr: A country with lots of income from natural resources won't become a democracy -- N

Check the resource curse on Wikipedia, regarding other oil countries. Tl;dr: A country with lots of income from natural resources won't become a democracy -- Norway already was a democracy when the oil money started flowing. It is too lucrative for the politicians to keep the population down, get external enemies etc and steal the money. (Also, too much free money distorts the economy -- this goes for Norway.)