I suspect too that Trump is simply not useful anymore to whoever actually has significant influence within the US.

Consider that Trump actively harms the US economy, in more ways than one.

• Trump's stance against "handouts" to the people cripple the US economy. Poor people will spend whatever they get. If they get $1K in handouts, they're gonna spend $990 in consumer spending, thus stimulating the economy. The economy is like a human blood, it needs to keep flowing sothat the human can thrive. Trump's crippling of consumer spending cripples the US economy, and that certainly is a problem to whatever feudal lords there are in the US operating in the shadows today.
• Trump's stance against renewable energy makes energy significantly more expensive, which again harms manufacturing (blue collar jobs) because cheap energy is the basis on which manufacturing runs. All manufacturing is a direct consequence of plentifully available cheap energy, and we all know that solar energy is the cheapest form of energy in human history
• Trump's cuts to NASA are a threat to a new and growing economic branch that robs people of a vision of future and aspiration. The exact consequences are hard to estimate today, but they're definitely cuts to the US economy's future.

Consider that the wealthy elite is heavily interested in a good economy; it is their life and blood.