Mass immigration is only one angle of change with late stage demographic transition. You can apply the same logic you apply to immigrants to demographic collapse. Some things:
Dysgenic effect of this demographic collapse. The population that is more likely to have children in modern context is population that is more likely to be prone to risky behavior. We are talking about teen mothers, people who also are more prone to addictive substances and so forth. It also makes huge difference when it comes to regional birth rate difference as well as various subcultures: for instance orthodox vs secular Askhenazi Jews in Israel.
The structure of post-collapse population is impacted in very important way. If you will have 15 million South Koreans in 2100 their median age can be close to 60 years. I is far worse than just having small population, it means that small number of working age people will have to take care of so many unproductive ones. Even if everything that you say is true and we will have some sort of robot revolution, this whole affair will impact the underlying political structure. I do not think that democracy as we know it can thrive in a situation where over 50% of the population is literally living on government dole or its equivalent.
Nevertheless I think you and Kevin Dolan are agreeing here. Birth rates are "not a problem" as long as some societies somehow will find a way to organize economic and political life so that people don't need to work and everybody will get what they need and want - as if this "don't work and get rich" is somehow a novel idea. I think in that case you just solved the people bottleneck by making people obsolete, as easy as that.
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Notes -
Mass immigration is only one angle of change with late stage demographic transition. You can apply the same logic you apply to immigrants to demographic collapse. Some things:
Dysgenic effect of this demographic collapse. The population that is more likely to have children in modern context is population that is more likely to be prone to risky behavior. We are talking about teen mothers, people who also are more prone to addictive substances and so forth. It also makes huge difference when it comes to regional birth rate difference as well as various subcultures: for instance orthodox vs secular Askhenazi Jews in Israel.
The structure of post-collapse population is impacted in very important way. If you will have 15 million South Koreans in 2100 their median age can be close to 60 years. I is far worse than just having small population, it means that small number of working age people will have to take care of so many unproductive ones. Even if everything that you say is true and we will have some sort of robot revolution, this whole affair will impact the underlying political structure. I do not think that democracy as we know it can thrive in a situation where over 50% of the population is literally living on government dole or its equivalent.
Nevertheless I think you and Kevin Dolan are agreeing here. Birth rates are "not a problem" as long as some societies somehow will find a way to organize economic and political life so that people don't need to work and everybody will get what they need and want - as if this "don't work and get rich" is somehow a novel idea. I think in that case you just solved the people bottleneck by making people obsolete, as easy as that.
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