Do you really suggest "having a big family" as the way to survive health problems and retirement? Because that's how it works in some (e.g.) SE Asian countries, and life there can be very harsh indeed if you strike adversity and don't have family to care for you. Some people are infertile, or have lost their children.

Not to mention that simply populating the world with more and more people is kind of environmentally short-sighted. I'd rather have the government bulk buying my meds, and lighten my overall footprint on the planet, rather than harking back to ancient times when there was little or no government, and family was everything.