Let me speculate about the best case scenario for a Full Trump Presidency.
Let's call him a full powered stress test for your constitution and democracy. He has shown that he is quite willing to ignore every norm and use whatever means are available to further his own interests. He will attack, demean and undermine every democratic norm, convention, system and barrier to protect himself.
So, chances are he will break anything that can be broken over the next 3.5 years (if he lasts that long), or possibly even 7.5 years. At the end you can pretty much assume a small set of possible outcomes.
1. Democracy is over and it is obvious, with at least 30% of the population in favour, 30% fighting it and demonized, and the rest terrified and/or looking for an exit. This is the worst case. Maybe elections are suspended or just so obviously rigged as to be pointless (where opposition is arrested, smeared and or harmed).
2. Democracy survives. In this case, if current trends continue, so much damage will have been done domestically and abroad that there will be a huge appetite for reform. International trade is in a tailspin, US markets are tanking, corporations are leaving, and unemployment is spiking. Maybe the dollar is losing its position globally as well.
In the second case, if the Democrats (or their replacements) can manage not to snatch defeat from the jaws of victory, there might be a wholesale set of reforms to the current, broken political system. Campaign finance reform, a reform of electoral redistricting processes, maybe some halfway intelligent banking regulation etc. etc. That can be a huge discussion.
Any halfway stable system will continue to function until its weaknesses overwhelm it, or in the case of human systems people find and use the weaknesses to their own gain. Trump isn't breaking the system, he is exploiting its weaknesses, which have been built and expanded upon by both parties for decades.
So I guess we'll see if this is just a test to see if your democracy is strong enough to survive an egregiously self aggrandizing moron. Despite your national mythology, that is not yet certain.