Is the writing on the wall?

It is widely known that empires who hold the global reserve currency are also normally net foreign creditors and net lenders. The British Empire declined—and the pound lost its status as the main global reserve currency—when Britain became a net debtor and a net borrower in World War II. Today, the United States is in a similar position. It is running a huge budget deficit and an even more huge trade deficit. We are currently relying on the kindness of restless foreign creditors who are starting to feel uneasy about accumulating even more dollar assets. The question is to where do they turn for a new global reserve, and when they do find somewhere else to go what will that mean for the US dollar?