The dollar will stay their but it will lose it's impact as global currency provided BRICS countries keep moving towards their common goal.
Why don't you take the euro currency into account? We shouldn't forget that the EU is a fairly large alliance of countries. Its GDP is almost 20% of the world's.
While the focus is on US hegemony and the BRICS countries, the EU continues to smoothly develop its economy and many industries. Therefore, the focus should be on this union, and not on the dictatorships and the states.