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...
Productivity has raised so much in the past decades that where you used to need four or five people working and paying taxes to maintain one pension, now we just need one or two. If we truly had a problem here we could even tax smarter the productivity and get more money for retired people without affecting the workers.
Plus, who says retirement needs to be paid by wage taxes? Why not by other means like taxes to the rich?
people should retire early at 55: employer funds their retirement for the next 15 years or so, then all elderly need to be gathered in social housing or eldery homes to save on hosting costs, reducing their pension to relieve the stress on the working class (but also tax employers correclty, employers are undertaxed)..but i cant imagine employers and politicians not peggybacking this..usually the goverment is the third party safeguard that is regulating all this to maintain a functioning society but most of the time the gov integrity is compromised by lobbies and all..