Saudi Arabia wants to end its dependence on oil — at the same time it's increasing production. What sounds like a contradiction is the work of Mohammed bin Salman, a 30-year-old deputy crown prince in a country accustomed to rule by kings who serve into their 80's. But a restless new generation has elders worried about an "Arab Spring," at the same time Iran's influence is on the rise. In the US, there's criticism of repressive rule and alleged links to terror -- as well as warnings that weakening the alliance could open the way for China.