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…
I fully expect him to try to change something, pull some underhanded thing like the VP switcheroo, or even try another insurrection (why not, he wasn’t punished for the last one? ) but as of right now he can’t run again.