Should economists replace Keynesian monetary theory?

Why do New economists say traditional Keynesian DSGE IS-LM models need revision if we are to miss another crisis? What new variables, theories or emphasis are incorporated and why? This is to be a 5-7 page economic analysis with annotated graphs of your understanding of the failure or success of IS-LM Models for managing monetary policy (describe in economic terms you are reading and studying in this course) and the Reforms made to correct the underlying failings of prior policies and regulations..