Seems like a win-win for us and the world, we no longer need their oil. They can literally go pound sand.
Things can get much worse in Saudi Arabia if the Royal Family collapses all of a sudden. Think of Syrian Civil War on steroids.
The only reason people out side of the USA want dollars is because the Saudis only accept US dollars for their oil. If the house of Saud goes down it takes the US dollar with it. You can thank Tricky Dick for that.