I agree with article.
As of current, the main reason China can become regional power is because of large land area, and large population. Can Republic of China size of Taiwan be super power? No. It need the size and the mass. If any country has a women fertility rate of 1.0 forever, the math garantee extinction of those country men, and women. I can calculate if for you. It's in discrete math class.
I will show some example. Suppose a majority of 80% has 1 child on average, and the minority is 20%, with 3 children on average. Only 3 generations, the table will turn.
gen 1 -> gen2 -> gen3
80/100 -> 40/70 -> 20/65 = 30 %
20/100 -> 30/70 -> 45/65 = 70%
Since China control large percentage of Mongoloid, which I belongs to, population in China must have many children to ensure the race survivability.