The best lies contain truth in them. Yes, there's nothing magical about $40 trillion. It's true, nominally. But if the conveniently-round number, in dollars (an arbitrary unit) and base-10 (an arbitrary base) prompts some people to poke their heads up and start asking questions, that's a good thing. Mind you $10 trillion might have been a better time, but, $40 trillion is a better time than $100 trillion.