For as long as I can remember, there has been a vocal group of doomsayers predicting financial catastrophe. Powell's speech is like catnip to that group.
Were you born in 2009? Because if your memory worked in 2008, you'll recall that massive government bailouts were required to prevent full on collapse: the doom you dismiss as though anyone fearing it is no less in control of their critical faculties than a household pet. That happened less than twenty years ago.