I think that Japan's low birthrate can only be fixed by a shift in their culture. I'm not going to pretend I know what that looks like or how successful it will be, I only know that it will be an uphill battle for the Japanese, and I wish them the best of luck.
This is literally how America grew.
Mind, you want to actually integrate people instead of running some godawful Gastarbeiter program.
Contrast this to your example, America (I am assuming you mean USA). While seeing rows and rows of homeless people is nothing new, today I saw a video of a homeless person slapping human faeces in the face of another homeless man.
There is more to this problem than just trying to maximise growth.
Except Japan is already "grown."
That aside, It's better to let the _overpopulation_ problem in Japan solve itself by letting birthrates fall than to continue the issue by importing more people. It's not normal to have cities with population densites of 6,158 persons per square kilometer. Yes, there will be an economic price, but it will be short lived (30 years) rather than something that will continue forever.
Otherwise he potters on with his meetings on the organisational side of the local bushfire brigade and looking after his 15 km section of a 1,000 kilometre long bushwalking track that runs past not too far away .. when he's not splitting wood, fixing gates, etc.
He's not altogether unusual in the area, there's a lot of still active older folk about the place.
Can you expand more on how everybody over 70 cannot function?
Also, officially after 65 they can stop working, so who is even going to work in the whole country??
People here 'retire' early also - those that stay active with volunter work live longer.
Japan has an aging population, it's entirely possible that those that are aged and active can contribute to the care of those that require assistance.
It's pretty normal for those who live in such places, and not really significantly more "unnatural" compared to sorts of social arrangements we evolved with over 100s of 1000s of years than, say, suburban style living where each nuclear family is significantly isolated from the next and there's no practical way of getting around other than by motorised vehicles.
I wonder what total % of the human population these days do live at densities over 5k/sq. km. - would be a non-negligible amount at least (China has a number of cities with significant metro areas that qualify), and if you lower the bar to 3k/sq. km, it'd quite possibly be a significant fraction, maybe even more than 10% of all humans? The only actual stat I could find is that "apartments accounted for 36.3% of all households globally in 2013".
Oh and Japan's population density overall is a bit over 300 per sq. km., so there's plenty of opportunities for those choosing to live in much denser parts of major cities to avoid it if they wanted to.
[0]https://earthlymission.com/capsule-homes-in-japan/
These aren't even the smallest ones. There are ones even half the size of these.
And yes some of those dwellings are pretty cramped, but is it somehow worse than the situation in many Western cities where there are those reduced to living in tents on streets or under bridges etc.? The "official" Tokyo homeless figures may be questionable (supposedly less than 800 out of a city of 15 million) but having visited a few times I can't say I recollect noticing any significant number of homeless people.
I'm really confused by your comparison to the US again here: is the homeless problem in the US because of overpopulation as opposed to drugs and mental illness, for example? If so, then if US cities are overpopulated to the extent that the homeless level has gone up so much, Japan is most certainly even more overpopulated, and it's a forgone conclusion that the population should decrease. If the homeless problem in the US is not due to overpopulation, then how is the homeless problem in the US relevant to the overpopulation problem in Japan?
In any case, the US fertility rate is also low, at 1.64. So I think it's fair to say the cost of living, the largest of which is housing, plays a crucial role in the fertility rate. A family can't live in a cupboard, no matter how "accustomed to the idea" one may be. At the very least, most people wouldn't choose to start a family in a cupboard, and that is certainly reflected in the Japanese fertility rate.
The combined population of China, Japan, and South Korea alone is 1586 million. They have negligible immigration.
So if "vast majority" is weighted by the number of people (the only sensible measure - Monaco and China should not have equal weight), then no, only a minority of countries are using immigration as a solution - just 37% of the countries I listed, by population.
Just to contrast how meaningless it feels to combine them - if you exclude Japan+SK from your count, the number becomes ~1411mil, barely a -11%.
So why should I exclude the most populous country in the world with sub-replacement fertility?
Sources:
https://www.macrotrends.net/countries/USA/united-states/popu...
Because you aren't grouping China with Netherlands or the US (which are the countries you are using to defend your rationale for including China), you are grouping China with Japan and South Korea. And the numbers there aren't even comparable.
China has just experienced it's first decline of 0.02%, while Japan's decline last year was 0.53%[0]. The factor of nearly x25 is the reason for why grouping them together seems useless at best and misleading at worst.
0. https://www.macrotrends.net/countries/JPN/japan/population
I cited the US and Netherlands as random examples of countries with population crises (absent immigration) as proof that China is facing a similar situation that drove those countries to choose immigration.
While I still might not necessarily agree with the conclusion you've reached, I can clearly see now why you grouped the countries the way you did, and your argument makes way more sense to me as the result.