But, it also seems obvious to me that we are seeing a new industrial revolution that'll wipe a lot of jobs, so less human work will be necessary. So, why create more people, if more people will be not that necessary in the future?
On the surface, it sounds sort of idealistic and environmentally friendly to just think about putting messaging out there to have less people for a better future for the world. But I think you have to consider the second order effects and political reality we live in.
Are all humans alike? Who is the type of person that would buy into this propaganda?
Maybe it's the smart and socially conscious people who should be raising large families for the betterment of society who buy into this message?
Maybe it's the borderline illiterate people who are quite irresponsible about raising families (bang repeatedly without condoms and have XX kids, depend on the state for support, are not good parents who raise their children to be good citizens) who would be completely immune to this propaganda?
If that's the case, then your idealistic idea just trades a future of many smart people and many dumb people for fewer people, but an even worse ratio of smart to dumb people, which might be far more destructive to the future of the world.
I think having diversity, different minds navigating different potential paths of human will always be an advantage. So this definitely emphasise how impoart our future education system should be.