So, relecting a person who has already shown a tendency to want to bend and break rules to stay in office, and is willing to simply ignore laws that aren't convenient is a problem. When that person starts installing sycophants into positions that actually control the military, financial and other fundamental levers of governing it becomes that persons choice, not the people or other democratically elected leaders whether to step down, or for that matter do anything else. The people who founded the USA understood that the president was just a step away from being a king and tried their best to counteract that. But, those people are a hundred and seventy years dead and the country has survived because the people elected to those positions were willing to adhere to the norms of governing, even if they didn't believe in the results.
So, I don't think anyone with any critical reasoning skills who has paid even the slightest attention over the past 12+ years believes that to be true of Trump or many of the people he is surrounding himself with this time. The McMasters who say "no you can't do that its illegal" are gone and daily any remaining resistance is being removed. Frankly at this point even if Trump steps down after 4 years. The Senators who have allowed it to progress this far have repeatedly abdicated their fundamental duty and are unfit for office (and that is putting it mildly).
If you can cut off funding to congressionally appropriate USAID programs, its just a likely you can cut off funding to the military unit that won't kiss the ring.
Since WW2 we have had a growing unelected federal bureaucracy (staffed by college graduates more and more left-leaning), that is controlled by congress as you mentioned. Congress is run by seniority, most are re-elected every year and are elected along party lines without much thought. And most legislation is written by lobbyists and activists. People are apathetic about congress, there is not much democracy there. People care much more about the presidential election.
I think if you look at the actions of our federal government over past decades you will see it has not been very good for the health of the American people. I think any action by a president to take back some power from Congress to upend that order is a good thing. Throughout our history certain presidents have completely changed the federal government during their terms in office, and afterwards the title goes back to more complacent presidents. Over time systems decay and you may need to start with something new.