Okay, so we actually have two main categories of questions.
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What are the chances that JD Vance will ever serve as President serving part of Trump’s hypothetical elected term?
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What are the changes that JD Vance will ever serve as President for his own (elected?) term?
First point, I’m still going to say that the election is too close to call, no matter how much I want to believe that there will be a non-nailbiter Harris win. IF Trump wins the election (sheer votes, voter suppression, some legal or extra legal chicanery are all possibilities) then, like others, I suspect that he’ll stumble through his term growing more addled and in poorer health, but not passing the scepter until he is dead and decaying.
So 50-50 win, but with the medical care and coverups by those who have no power but through Trump, say a 80-20 chance in Trump’s favor of staying the course.
The second question is much, much murkier though. Honestly, there’s far too great odds of Trump making his threats of “you won’t have to vote again” a reality, and us descending into a cold-to-warm civil war. Of course, if that happens, then the odds of some sort of assassination goes up, which brings us back to the first question again. But no, I think what will happen is various Democratic states going their own ways and ignoring what happens on the Federal level, kind of like how Texas and other Red states are just choosing to not comply in many cases, and waiting for 2028. Again, coldish de facto civil war, and one that could be quite extended.
A much more pleasant answer for the second question becomes if HARRIS wins: will JD Vance ever be a viable candidate on his own? I don’t think so, because if Trump doesn’t win, Trump will blame everyone else for causing a loss, and with Vance’s limited popularity, “non-white” wife, and other baggage, he’s a perfect scapegoat. Which will largely tank his chances, although with his financial supporters, I shouldn’t say he has a zero chance of at least running for the position in the future.