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…
JD Vance is a douche canoe who would ramp it up 2x or 3x and would likely do the bidding of whatever master he follows now.
But no one likes the guy and I doubt he could inspire Trumps followers to the same degree Trump does. Without that rabid core base his power falls apart. Without a true leader, MAGA will start going at each others throats. There are too many factions both held together and held in check by Trump.