Just putting this out there for all in this thread:
1. I agree with
@bluetree700's points completely. It is better to be prepared and mindful of a minute but non-zero probability, than to "do an America" and ignore / downplay until it is too late.
2. One thing I want to watch out for is falling into the same thinking patterns of westerners in the 90's and early 2000's. Look into just about any article on China from that period and you will see what I'm talking about. Complacency is a bitch, and no-one wants to see China replay the 1990-2020 America act.
3. While various facts have been pointed out in previous messages (with ample proof), that contrast China's development and makeup against India's, incremental improvements in large populations still do make a difference. Quantity is a quality of it's own (and this argument is already sounding familiar to 2000's era western arguments).