I would describe the elements of Trumpism as follows:
- Swagger, to the point of toxic masculinity;
- Constant divisive and inflammatory reactionary public statements on race and culture;
- Orthodox GOP positions on taxing, spending, and regulation;
- Open contempt for liberal democracy and its norms, both at home and abroad; and
- A foreign policy based completely on the perceived short term material needs of the United States, without regard to national values, existing alliances, or international institutions.
How much of this will survive his departure from the scene, whether now or later? Swagger has been an integral part of the GOP brand since Reagan; no GOP candidate for the presidency can survive without it. The trick is to mute it slightly in order to avoid offending so many women. The taxing, spending, and regulation thread will be followed by any future nominee, barring a surprising move to economic populism on the part of the party. #5 will almost certainly disappear, as it is unique to Trump.
The real questions are #2 and #4. My guess is that the results of the 2020 election, even if Trump loses, will be used as evidence that behaving autocratically and constantly throwing red meat to the base is a winning strategy even if it offends a majority of Americans and threatens our institutions. That is the tragedy of November 3, regardless of the ultimate outcome of the presidential race.