What I didn't think to do then, is to illustrate the shape of the Dow if it continues to be as volatile as in the last 40 years. So here goes - same average growth, same inflation rate etc:
It's the volatility that does you in. As Keynes said, "In the long run..."
Matter of fact, if history repeats itself, there's a point around 2021 where in real terms, we're behind where we were in 1967. This time, I will buy beads and wear flares. I'd still be younger than Robert Graves was last time round.