People who can't afford to settle down, who are spending significant amounts of their income on rent, and who don't see much reward for their effort tend not to have children. In the long term that leads to an aging population, which can cripple the productivity and growth of entire regions. That can be combatted to an extent through immigration policies, but only if people actually want to move to a region that needs more people.
These are not just first world problems. These are problems that could, potentially, destroy entire economies.
These are not just first world problems. These are problems that could, potentially, destroy entire economies.