Comment: Love it, but...

One comment I would make - with the caveat the I might be missing something: it's not really fair to say "Take your $350 monthly car payment and replace it with a used car paid in cash." Obviously, you have to pay for the used car. What would be more appropriate would be to do the math around the cost of ownership of a new car compared to a used car (which is probably ~$125-175 per month for a used car comparable to a new one that would cost $350/month), and assume that the difference is invested.
Other than that, I agree with what someone said below and the crux of the argument for sound money. $3.5mm of purchasing power in today's dollars will require over $15mm in 45 years under normal inflationary conditions. In light of the fiat currency debasement that is likely to occur as a result of the global money-printing now in process, who knows what the future dollar figure is. THAT SAID...
Great idea, great execution. Thanks for creating and sharing.