Actually population is not so much a problem as corruption and nepotism.
I prefer to see India as a land of 1.1 billion opportunities rather than 1.1 billion problems
Imagine what would happen if they could be given proper education and health care and given a decent government to work.
Like I said before, lots of doomsday predictions about India going up in flames and struggling from famine to famine have been made, but they have all become unstuck.
Moreover, militarily India and China have nothing to gain by conlict.
Neither of us have any anti-missile capability, but still enough missiles and bombs to end each of our civilizations
However, there is much more to gain by working together and this is what we are seeing today. Trade between India and China is growing and there is more and more military cooperation as well.
As of know, a serious problem is coming in China's way through an overheated economy which may burst the economic bubble, whereas in India, some unstability in the government could cause a slowing down of the economic growth.
So, as we try and sort out problems at home, the rest of the world can argue itself blue as to who will win if India and China fights. I have an inkling its going to be neither.