Trump will end with at least one undeniable achievement--he is disrupting institutions and norms. He may and likely will become less disruptive as time goes on, but disruptive he has been.
The economists have a favorite concept for market economies: "creative destruction". Among the things it means is the corporations and technologies dominant in 1950 are mostly gone by now: United States Steel, Bethlehem Steel, AT&T, Kodak, A&P, Sears and Montgomery Ward, etc. etc.
There's an easy parallel to make: creative disruption. Is Trump triggering a political realignment? We'll see.