Dollar is eventually gonna be replaced by Yuan (chinese currency).
Right now the better yielding fiat currency then Euro, Yen and others is Dollar. It's because of interest rates, which are currently at 1.5% - 1.75%. If you compare for example with Europe, they have negative interest rates. That means that you are punished for storing money in your bank account.
So the capital now flows into USA. That means Dow Jones will keep hitting record highs.
However the shift will come and capital will be redirected to China which will become economical powerhouse of the world. It should happen in 10, maybe 15 years, no one knows the exact date of course. But it will happen
Have you ever heard the term seizing is easier than maintaining?
China as an expert in duplication and modification is now challenging America and trying to change the center of gravity of the world from America to China. Learning from the American strategy, China made a long-term program OBOR (One Belt One Road) as well as aggressively reducing the USD in its foreign exchange reserves and replaced with gold with the aim of reducing dependence on the US dollar.
But I think it is still difficult and even impossible for Yuan to shift the dollar considering that the portion of the Yuan Currency in Global Foreign Exchange Reserves is still very small.
http://data.imf.org/?sk=E6A5F467-C14B-4AA8-9F6D-5A09EC4E62A4Besides that, one of the reasons why Yuan is less popular as a medium of exchange in international trade is because the value of the Yuan is pegged by PBoC (Bank of China). PBoC control over the exchange rate becomes less favored in trade transactions. PBoC can at any time weaken or strengthen currency exchange rates. Of course, it would be less profitable to hold the yuan, then the PBoC would significantly depreciate the exchange rate.
The final reason in international trade is that there are no eternal friends and opponents, only eternal interests. So to replace the dollar, the Yuan must be supported by many countries in the world, but with all the current geopolitical turmoil and international geostrategy, it will be very difficult to shift the dominance of the dollar with the Yuan.