I want to hope along with you but if they didn't reflect on themselves after '16 you can bet you bottom dollar they either never will or they have a different idea of what success looks like than what you or i can grok
There won't be. Trump leaving office was already highly detrimental for all his bullshit claims his cultists accept. If he gets in again, he won't leave.
If Biden wins why would they change a working strategy in 2028? They can do it again! Or maybe they can field Hillary Clinton again. We all loved Hillary.