The premise makes sense for Trump as opposed to the more traditional autocrats arising from representative governments. Trump views everything in terms of wealth as power, or power in terms of retribution. He’s a very petty, unimaginative person.
The more traditional autocrats, who often arise from the military or security organizations, would probably disagree: see Putin’s Russia, where you can be as wealthy as you want and it still doesn’t insulate you.
Trump’s version is going to work (sadly, IMHO) for about a generation. Gutting regulatory organizations that aren’t directly answerable to him, creating epic chaos in the military by promoting unrespected, underqualified individuals who owe all their power directly to him, and consolidating all power in his personal executive authority with the aid of a congress beholden to him (or they’re primaried) and a Court that is either venially corrupt, or subject to other pressure.
I have zero doubts that if Trump survives his 4 years, he will stay in power past that, via whatever figleaf is managed, but when he eventually becomes non-functionally senile or dies, that’s when we’ll see if we end up in an oligarchy.
Because there’s the political critters that wish to take over from Trump (DeSantis and his ilk), the plutocrats (the main subject of this thread), the Christian Nationalists (who aren’t always in fully agreement with either), and FSM knows who else. I’d also put money on an ambition Flynn-type who smarms his way to military power under Trump and has his own ambitions for the “good of the nation.”
So take your pick. Figure we have pretty much equal chances between a slowly dissolving oligarchy as the center rots away, a hybrid political-economic aristocracy similar to Cold War to Pre-Putin USSR, various flavors of semi-Civil War, or a combination of any/all that lead to a fundamentally failed state.
Just to be clear, I don’t disagree with the OP - Trump’s ideology of power is an Oligarchy where only he gets to cheat. And the Musk/Bezos/etc groups sure think that they’ll be the new rulers. I just doubt it’s going to be as easy for the future heirs as they think. People who are smart (or consider themselves smart) always seem to ignore the chaotic element that results from breaking everything in their way, and just assume it’ll keep working the way they expect.
I honestly give us less than a 10% chance of pulling our Democracy’s nuts out of the fire.