I don't really give MAGA much credit, but I do agree with you that they see Trump as a vehicle, but it cannot be to "reorder the USA" because there will be no semblance of any recognizable USA if Trump were to get his way. I can list a ridiculous litany of things that make Trump such a poor choice for president that it takes overlooking the most horrific human qualities to support him. At the top of the list are these: He is immoral (cheating on his pregnant wife with a porn star and other women), he is a pathological liar (fact checkers cannot even keep up with is inventions), he is a sociopath (not good for anything anywhere except for himself), he is a con artist, he is a lifetime criminal (when he gets caught and has to face justice he whines like a sociopath at how unfair it is), he is a convicted rapist, he is disrespectful to everyone, he has committed treason (sharing top secret information with those without clearance), he stole top secret files and stored them in his home, he has a low IQ, he is terribly unhealthy, he is a serial sexual offender, he is woefully ignorant of the subjects that matter (history, government, civics, international diplomacy, and so on), and on and on the list goes.
And I agree with this that you wrote: "The political left is not united. If the D's do nine things right and one thing wrong, the D supporter will seriously consider "not voting.""
Trump has no redeeming qualities as a human being, let alone a president. Never under any circumstances, should a person vote for a sociopath to be president.
MAGA people are not thinkers, they are blind followers who have fallen for a vacuous con artist.