I'm sure Miller's days in the White House will be numbered once anyone other than Trump is in the driver's seat.
If he does die in office and Vance takes over, I think things could get very interesting in some good ways and some not so good. I don't think any of us has seen the "real" JD Vance yet. When he became Trump's running mate, he totally made himself over to Trump's specifications, but I don't think he's ever been a true believer. He's just a power hungry guy who was willing to sell his soul for a chance to become veep, and I suspect he's not at all happy having to spend his days apologizing for Trump's bloopers and trying to convince people that everything is okay despite the evidence they can see with their own eyes.
On the positive side, I think that he'll likely do a complete makeover of the cabinet in addition to making changes in the White House staff. He'll probably replace the current clowns with much more competent people (not that that's a very high bar lol), and he won't be a completely unhinged, dementia-damaged lunatic. On the negative side, one thing we do know about him is that he's extremely anti-abortion and probably anti-birth control as well, so he'll no doubt suck where those issues are concerned. But whatever happens, he won't just be a continuation of Trump. He'll be his own man, whoever that is. 
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