There is no chance of Saudi Arabia becoming a great world power any time soon. Fear is the combination of disagreement and power. The USA may disagree with how Saudi Arabia runs things but the KSA has no real power, so it doesn't get much attention and can be an "ally of convenience".
> There is no chance of Saudi Arabia becoming a great world power any time soon
No in the conventional sense, but they have spread their ideology to such an extent that most people on earth won't draw a cartoon of a particular historical character using their real name.