[yefragetuwrabrumuy]

Both India and China have the same, growing problem likely to push them into war—demographic imbalance. A preference for male children has created tens of millions of men with no chance to ever be married, much less be employed.

The inherent danger of this is immense. If these men do not end up creating immensely bloody civil wars, it will likely only be that they are too busy butchering each other on the battlefield. The two nations will have little choice but to send tens of millions of men to their doom.

[Cronos]

you're right -- they will have 35 to 50 millino surplus men each by the 2020s. however, why wouldn't they use it to colonise "easier" areas? Like for the Chinese, there is Tibet, East Turkestan and Siberia while for India there is the East coast of africa.

The Chinese will also find that the snakes they've been feeding will come back to bite them -- the Pakis and the Taliban will next turn to Xinjiang/East Turkestan/Uighuristan and convert that movement from a search for freedom from Han chinese decimation, into a jihadi battlezone.