Antinatalism and eugenics

I assume certain demographics are more likely to not have kids as part of antinatalist beliefs, since it is usually centered in sociopolitical factors. Even biological factors such as inevitable health problems and ageing isnt due to a lack of human advancement, its the systemic inequality in the applications of healthcare and much more.
So my question as someone on the fence as to whether I agree with antinatalism as a conclusion,
will the underprivillaged groups who are more vulnerable to lifes suffering be "genetically removed"? I get that it is just a matter of personal philosophy and autonomy, with no real upsides to "carrying on the bloodline", but I'm just curious of a reality where antinatalism becomes even more widespread and the generational effects of this?
Or is that idea of the western working class and imperialised countries individuals having loads of kids too much of a reality for any tangible impact? So its more like those who can exercise reproductive autonomy might as well?
But just in general those who see it as not only a moral standpoint but advocate for its application, how do you picture the future with an already predicted drop in birthrate? Obviously the human race dies out and its brilliant but I mean in the run up to that, is it just a small population of vulnerable and old people under civil collapse? I dont know if im missing something.