Sure, there was the attempted assassination of Reagan and the fears for Obama as the first black President, but in those cases it was a lone nutter rather than a conspiracy.
How long can Trump crash the market before an angry billionaire decides to take him out? The remaining Koch brother is already pouring money into legal challenges against Trump…
The only thing possibly holding them off is that there’s 2 or 3 factions all wanting to long knife™ eachother at the first chance, which means they have to be ready to go as soon as the power vacuum happens, and one of the factions controls the VP seat.
That might delay the chaos a bit, but not for long.