Confidence is gradually shifting to Asian markets since they have the most per capita growth rate right now. Which I think is unfortunate, because I would rather not see China as the world's next hegemon.
As for the U.S. dollar, it's hard to say. It really depends on the inflation rate and the unemployment rate. Both are tied to spending power and in our consumerist economy that matters. For some reason, our politicians (and GOP) think it makes more sense to gut worker rights and unions in order to make us more competitive with China - and we never will be, not when their population is four times ours - than simply invent a new system that the world can transfer their faith to.
There are many growing social movements all over the world that make the 99% movement look like a walk in the park, all based on the sentiment that people are tired of their lands, resources, and ways of life being destroyed to benefit a few globalist plutocracies -- especially when in the past 80 years we have come so close to tasting freedom of the people in very practical, tangible ways. America is the undeniable epicenter of those plutocracies.
Our dollar does not hinge on productivity anymore, but whether or not other countries want to drink the koolaid of the American way of life. Increasingly, they don't want to, not when they are witness to our own degeneration. If the globalists do to the rest of the world what they are doing to American freedoms, then faith will not be maintained, and the dollar will be devalued.
My estimate is the next couple of years.