As seen over the past few decades, $50k doesn't go as far as it used to, and I see no reason not to expect the same in the future compared to now. In 30 years $50k might be poverty level income.

Sure but that ignores everything about compound interest. And most people don’t live too 100. Consider it reducto ad absurdum on my part.

That's why you invest the $5m, not just keep it in cash.