The seer population sizes of China and India and high growth rates of these two countries will make sure that there is high chance that these forecasts about India and China will come true, unless some major economic or political upheaval happens.
These projections do not take into account political upheavals (e.g. Donald Trump, who has promised to create jobs in the US and reduce outsourcing), impact of technology on the Industry (e.g. robotics as the new form of cheap labor) and conflicts that can hamper growth.
Like it or not, the lure of cheap labor in India and China is in decline and will become much more prominent in coming years when robotics will substitute humans in various fields in practice. Tesla has already adopted his model:
https://defence.pk/threads/state-of-the-art-automobile-manufacturing-techniques-of-tesla.460626/
You might have noticed that Chinese economic growth is slowing down and value of yuan is in decline accordingly, in current times. China is now looking forward to diversify its economy and working on its
One-Road-One-Belt project as a mechanism of sustainable growth. Chinese Think Tanks are coming to terms with the fact that it will no longer be able to retain the mantle of "global manufacturing hub" at some point in the future.
India will likely witness and/or experience a surge in foreign investment in coming years because it is being perceived as an alternative to China in this regard. However, do not hold your breath on this.
American Industry is also experiencing revival and Trump has promised to facilitate this revival with favorable policies. More importantly, American Industry has discovered a new form of cheap labor: robotics. Human roles will be increasingly service-oriented and managerial in the years to come.
US is moving towards self-sufficiency in all walks of life with its renewed focus on alternative sources of energy to revive its domestic Industry, and this would be a game-changer for the world: a self-sufficient US will be at its strongest and most assertive. Anybody who thinks that US is in decline, needs to come out from the self-delusion.
So projections can be misleading but one should focus on the emerging Industrial trends to figure out what may happen in the future.
FYI:
http://www.forbes.com/sites/singula...g-and-rebirth-of-u-s-industry/2/#643ccda9347d