I think the bolded portion of #4 is what I find least likely. IF Trump loses, he will have been a one-term president who squandered 2 years of complete governmental control and he will be blamed for downballot races from formerly strong GOP members. As the saying goes, Success has many fathers, failure is an orphan. Additionally, many of Trump's supporters do so because he has this image of being a winner, and being invulnerable. He says and does whatever he wants, and all the attacks on him don't matter because he's "Teflon Don." The second he loses that image is shattered. He's now a loser - the absolute worst thing he can be according to him. Pence will have similar problems - after an absolute pardon of Trump he'll be seen by a majority of the electorate negatively.
This argument I'm sympathetic to, as I think it could indeed go that way. But Trump is very actively laying the groundwork for disbelieving the results of the election, because "millions of illegals mailed in ballots" or something. The fact that it has absolutely no basis in reality hasn't mattered
yet, so why would it start? And further I don't think they love him
because he's "Teflon Don", I think they love him because he acts the way they wish that they could act. The fact that he's "Teflon Don" and gets away with it is
part of that, but not necessarily a foundational piece. If he experiences zero real consequences for his actions then he
still is getting away with it, despite haven lost a "fake election".
With Dems controlling the WH and House and (very possibly with a Trump lost) the Senate there will be a level of scrutiny on the previous administration which we haven't had yet. They're going to use it to make Trump/Pence look bad *even though Trump will be immune*. They want to make sure that every sitting GOP senator is forever tied to Trump's misdeeds, and to a large extent that will extend to Pence.
Will they? Or will Biden try to "help the nation heal" by "looking forward and not back"? And anyway Fox News / Trump News Corp will keep on saying that it's all a fake witch hunt by the deep state to discredit the best president ever. Who are Republicans going to believe?
I also see no reason why Trump would honor a back-door pledge to Pence, given how many times he's publicly burned even loyal supporters when they cease to become useful to him. As former president Pence is called to testify and confirms all these negative things about Trump, he'll do what he always does, and go ballistic on him. See Cohen or Tillerson or Sessions or Ryan or Mattis or...
See here I flat-out disagree. Trump turns on his loyal supporters the instant they tell him "no" on even the smallest thing,
not when they are no longer useful.
Cohen when faced with jail time for his own misdeeds decided to cooperate with the investigation. Tillerson disagreed about pulling out of the Iran nuclear deal. Sessions recused himself from the Mueller investigation. Ryan spoke out against Trumps rhetoric. Mattis resigned in protest over the abandonment of our Kurdish allies. Etc for every other example.
It's not that they're no longer
useful, it's that they
disagree with Trump about something, which in Trump's mind makes them no longer loyal. As long as Pence stays whipped-dog boot-licking loyal he has nothing to fear.
And you didn't answer my question (or I missed it). What
benefit does Pence gain in betraying Trump? I don't think "history" is going to look too kindly on him either way, so it has to be something more than that.