View attachment 128776
I really wouldn't worry about demographics too much. South and south east asia have been in the grips of a massive record beating heatwave and it's miserable, I'm in SEA and I'm sweating it out here. Climate change is real, it has been noticeably getting hotter and hotter every year, and this year people are finally noticing. I think we will see the start of a massive climate crisis and a wave of climate refugees in the future as the heat continues to rise. Even if it's not life threatening, it's a massive drag on quality of life. And I think it's starting to get to the point of being life threatening.
Countries in the higher latitudes will be desired and a popular migration target. So mainly countries like China, Russia, Europe, America, Canada, South Korea, Japan. America, Canada, Japan, SK and Europe will be desired as always, but mass migration is already becoming a lot less popular than it was 10 years ago and there's going to be a hard limit on many people are going to be accepted. Japan and SK are pretty small and can't accept that many people as it is, even if they want to open borders entirely. And people tend to choose the shortest path. People in South America go for America. People in Africa and the middle east go for Europe. People in central Asia go for Russia.
So a lot of people will have no choice but to go for Russia and China . Russia is gonna have a hard time accepting migration with the state of the country as it is and quality of life is worse then most of China now I would say. Most of the affected nation will border China and thus have an easy route into the country, and SEA can most likely integrate pretty well into China anyway.
Which is to say that I think that in a decade or two as it continues to get hotter, there will be a steady stream of people from SEA and south asia that will be desperate to move to China, a very different situation from today. It's up for China's own immigration policy to see if it's willing to accept "mass migration" of this people or just select from the crop of the cream and reject the rest.
Not to mention that if we live in the future where widespread crop failure, famines, droughts and floods are a lot more common, large population aren't as much of an advantage as they are today, where food is plentiful. A.I and automation will pick up some of the slack anway. It's far better for be a economy on a decline, but an nation with frequent famines.