The problem comes when you insist that your kids don't need the workplace protections and quality-of-life assurances that allowed your parents to have four kids on a single machinist's salary.
Giving birth to one (1) upper-middle-class white kid cost us $70k in savings. Raising her is about $20k a year excluding food and shelter. That's 5 horses worth. I know rich people, but I don't know anyone with five horses. My dad's private plane cost less than that, and costs less than that to fly.
When "having a kid" is around the same financial impact as "racing Porsches" there will be far fewer kids, and when you're dependent on those kids' taxes paying for your dotage you're gonna be fucked.