No, there actually is a genuine concern here, and it might be unsolvable, one of those "contradictions in capitalism" the marxists used to complain about.
Heres the problem,
On one hand, the basic physics of resource consumption is that theres a hard limit on how much stuff we can dig up/grow/etc and its pretty clear we are pretty close to that limit. At least if we want to have a planet we can actually live comfortably on.
On the other, populations around the world are ageing and once people hit a certain age they need to stop working because of health, capacity and frankly dignity. Nobody wants to be a 90yo working in a factory. And frankly its almost certain by that point the body just isnt capable of that at all. So as people retire OTHER people need to produce items for them to consume so they dont starve and die (and get medicine etc). I read somewhere you need 3-4 working people per retired person to have a situation where everyone can get food and shit. And that means if were not replacing people at a high enough rate with children, the economy will collapse (For an accessible example of this watch this video about south korea https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3F... ).
I dont know if this is fixeable outside of massive automation. And unlike the earlier mentioned marxists, I dont think a change in economic system would actually fix this (Though it might solve other problems). We're kinda fucked unless we can throw a LOT of robots at the situation. All of us (Japan is not alone in this problem. Far from it)