IMHO the flaw in his assumption of gold peaking would be that gold is an investment. It isn't an investment per say, it is merely one of the rarest and most versatile elements on the periodic table. If he turns his graph upside down he will see the true picture and that is that fiat money is going parabolic downwards. An ounce of gold is still just that, an ounce of gold and has no counterparty risk attached to it.