Depopulation isn't a big of a problem for the wealthy as it is for the working class. I don't know about the US, but in countries like Italy where retirement pensions are paid by the state through taxation of workers wages, depopulation is the biggest threat possibile.

This kind of system requires workers to be more than retired people. Every year some people retire and if new borns aren't enough to fill that gap, we get a situation in which retired people are more than the workers. This means less wages to tax, that leads to low pensions for who's already retired and also people who are still working will be able to retire much later and with even lower pensions.

This scenario is catastrophic for young people like me and I think other european countries are facing this very same problem. The next decade will be tough to say the least...