> In 1, 2 or 3 generations time we will see (whoever lives to see it) what happens to ever-rapidly-growing demographic areas. I suspect it isn't going to be pretty if they wait until they hit a hard limit to stop.
Much of Europe used to have developing country demographics in the 19th century. They didn't hit a hard population limit.
At some point, all societies will have to face a stable/decreasing population pattern. The later, the more severely they will have to face this situation. Japan has done it without falling to pieces.
From my point of view the demographics of Japan ARE great.
In 1, 2 or 3 generations time we will see (whoever lives to see it) what happens to ever-rapidly-growing demographic areas. I suspect it isn't going to be pretty if they wait until they hit a hard limit to stop.