Trump's narcissism

This somewhat longwinded post by David Auerbach captures pretty well my own working understanding of the Donald Trump phenomenon, as well as the cultural moment in which he could rise to power. It leaves unanswered two pressing questions: If Trump is not a conventional demagogue, of which we have ample historical examples to study, how can we predict what a Trump presidency would look like? And given that his campaign is not about ideas, and that attacks on his character are absorbed as if praise, what can be done to defeat him?