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If we really thought about it, there will be a raising amount of people who don’t have a job and will not be able to get a job ever due to the decline in human labour needs, which lead to fewer jobs being offered globally which means that with fewer humans around there will be a higher chance for people to get a good job.
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Humans consume resources, with less humans around there will be more resources for each humans and they will collectively consume less resources in total.
Humans don’t have a modern economic or social model for what is about to happen to most of the developed Western world as well as Russia and China.
Having a smaller cohort of young people means less consumption, fewer children being born. Before you get your dander up screaming about how great that is for the environment. Just remember that fewer young people means the pace of technological change is likely to slow down, there will be fewer young people to support a larger elderly population which will likely mean higher taxes and yet fewer children.
Japan has been going through this process for years. However they were a single developed country in a sea of developed countries that had rising working aged populations. They offshored production to countries with labor pools and were able to position themselves very well because of that. That is not the scenario the rest of the developed world will face.
The world will likely be a very different place in 20 years. Nations historically held together with ethnic majorities that have passed the point of no return to repopulate may no longer exist in that span of time.