Yes, maybe.
That's a fair comment. However, it's countered by the fact that an awful lot of people are going to be doing basic labors. The basic labors need to get done, and someone is going to be doing them too.
Given that, it's it realistic for very large fractions of us simply not having kids?
Does not seem that way to me.
Anecdotally, the janitor at my school as a kid was not a smart man. Not dumb, just not intellectual. But, he was a pretty great dad and his family did well. They didn't have much, but they turned out just fine. Some of his kids ended up moving up and out on to better things too. I've often thought about that dynamic.
We never know how this stuff turns out. I, myself, grew up in relative poverty. Not just lacking luxuries, but sometimes basic needs. Honestly, didn't do me any real harm, and I'm sure glad I'm here as are my peers and family.
To me, the problem is one of how we value people rather than their decision to start families. People always start families. This is primal. Inherent feature. We need families. Most of us do anyway. Some of us don't. But that doesn't align with the job / value problem.
We need the janitor. Somebody is going to do that work, and what basis is that for denying them basic human dignity? Or, maybe we don't really need the janitor? Ok, that means we do a lot more ourselves. Wouldn't some people make the case they are wasting their time having to do that stuff?
Of course! As they should, and that is precisely why we need to value the janitor. The labor isn't sexy, but it serves an important purpose, even if that purpose is to free some research scientists to cure cancer faster.
If somebody is working full time, maybe that needs to somehow be enough to live a modest life, and to me, that life includes a family. Maybe both parents work. That's OK.
Should we actually put weight behind that idea of waiting to have kids in a time of relative financial security, quite frankly, way too many of us won't be having kids! Worse, that means way too many of us are deemed unworthy somehow, and is that really the right thing to do?
Given we need those basic labors done?