I think China will be the world leader, as we watch America slowly decay before our eyes, and the values they once stood for erode away. The corruption, the tyrannical two-party system, it isn't going to last much longer. In the current state, America is too stubborn to allow the big changes which is needed to fix these issues. The two-party system hinders progress, as each side fight against each other. I think society will come crashing down at some point, either through a revolution of the people tired of current corrupt system, a financial collapse, or a war. The issues lie deeper as well, as any nation which rules by the principles of capitalism is destined to fail.