The demographic pyramid is completely fucked up in many countries, with locals not having kids because basically millennial cannot afford to live on their own due low wages and high cost of living. In Europe it's all over the place.
Idiocracy at it's finest 
Isn't a more fundamental cause of the problem the fact that "money" earns more money than "work"? It just keeps spiralling down, meaning you have to work more and more to be able to afford the same things, making it less and less likely to become wealthy, while the ones who are wealthy already see their fortune increase without working for it.
Over the years, I've seen many documentaries about this, and they all conclude the same thing: it's a bad thing for the country as a whole if a few people own almost everything, and that's exactly what's happening.
I know young people with fixed jobs, but I also know many young people who've been working in temporary jobs for years, and don't really have the time and space needed for kids.
I've seen taxes go up in the past decade, and disposable household income hasn't been able to keep up with economic growth for a very long time. It's a slow change, but long-term it can't be sustained.