So a decent middle class life has become too expensive, work doesn't pay enough, isn't stable enough, and is too uncertain to find in the first place? Yeah, those are all logical reasons to hunker down and not sign up for a 20+ year economic commitment.
I have one kid, one and done. I honestly find that USA culture is low level hostile to kids. There is no playground within walkable distance of our house (just a grassy park mostly used by dog owners). Kids playing in the street, or even just walking solo in the neighborhood open you up for having some Boomer calling the cops or CPS on you (same Boomer's that raised Gen X as latchkey kids). Wanna go to a public pool, oops, those are mostly gone. Go play soccer? Sign up for expensive programs and mandatory uniform purchase so Suzie can kick a ball with some friends at a far away field a couple times a week. Yay. Public schools are underfunded, and struggling. A Bachelor's degree seems not enough to get a good job anymore, so plan on pay for 6 years of college, not 4. Great. Childcare is way past unaffordable, and is not findable anyway.
Wanna risk having a disabled kid? You'll get very little economic help to raise them, and the support system for kids graduating into adulthood with major disabilities is cruel, twisted, and underfunded.
Wanna take your kid on a plane (or to any public space), you'll risk offending those around you if your kid acts like a kid. Kids should be welcomed as the newest important members of our society, but instead are treated as nuisances.