> retired boomers
That isn't where the money propping up the SP500 is coming from. It is a ponzi scheme, yes. It is held up by $40,000,000,000,000 in national debt. That can is getting kicked down the line to one or two generations that haven't been born yet.
You and I don't need to worry about it because we will be long gone by then.
All we know is that Elon isn't getting any more freshly minted currency.