GC- There have beeb people going on about this for over twenty years. They have been uniformly totally disproved. Their views are simply not related to real wolrd economics. The $ is the World currency thats the way it has been, thats the way it is.
If there were to be a radical readjustment in the exchange rates the US would not be the main sufferer and the rest of the World knows it.
It is clear that there are fundamental structural changes going on. Europe has lost its economic raison d'etre and will have to get used to a much reduced standard of living and prospects.
India and China are going to have increasing prospects and prosperity for the next fifty years or more. The US is the driver and benefits either way.