Really?? How did you come up with these predictions? What are they based on?
They are not predictions now, basicly NAFTA for example is a free trade agreement, it means that the trade within the NAFTA partners will increase their trade by paying very low taxes, this was made in order to increase the potential markets of each nation.
Mercosur has a similar arrangement, Brazil can flood its South american neighbours with goods made in Brazil.
While is unlikely at least Now there will be a political union in North America in the near future is not unlikely they might have a common currency in 15-25 years from now; and the same applies to Mercosur and UNASUR
these two trade agreements are designed to assure a basic market to the members states, these agreements also ease the investment processes.
Now if you tell me what technologies China has that India has not, i will say very few, India is able to develop computers, cars, satellites, jet engines, tractors, heavy equiment, CNC tool machinery and only is a bit behind in manned space exploration but slightly ahead in software development.
Brazil is the same, Brazil is capable of developing computers, cars, airplanes, rockets, tractors, heavy equiment, CNC tool machinery and only is behind in space exploration.
So by Brazil having Mercosur and UNASUR they have assured a common market with Argentina and other south american nations.
India has already a population as big as china and a rate of growth as fast as China, then India, the USA and Brazil will be stronger than usually thought and will assure larger markets for their goods.
So the international trade between these nation won`t be in Chinese, and the US already has kept Mexico in its sphere of influence economically speaking assuring a 125 million people market to ist 300 million in 2020 plus a less than 45 milion market Canada will have in 2025, central america sooner or later will join NAFTA and already severla nations have signed free tarde agreements with NAFTA member nations and this will add at least 50 million people more to NAFTA.
So the US will use NAFTA as a first step to increase its economic recovery, the fact the canadian dollar today is worthed as much as the US dollar makes economic merging even more likely.
The Economic Influence of India will be quit similar to China`s in 2020.