I recall reading an article that argued that Saudi Arabia was gong to be in financial trouble in the medium term future as apart from oil, they produce nothing whatsoever. Everything has to be imported.
Other similar adjoining countries realised the folly of relying on the one source of income years ago, which is why we now have places like Dubai.....sandy deserts, transformed into tourist attractions.
But the Saudis are being left behind. The already have serious civil unrest, which can only get worse as time goes on.