What replaces him might be worse

He's a seriously bad negotiator and poor businessman, he's going to a Ferenghi hell, those are major sins

The Ferengi would mock him mercilessly, he is a cheap fraud and doesn't have the lobes for business.

My heart fluttered for a second, then I realized I’d have heard honking and probably gun fire if he’d died.

Meh, could be more hellish. 5/10

He can get in as long as he can provide a single quote from the Bible. I'm reasonably confident that will prove to be enough of a barrier to entry.

Unfortunately his cult will call him a martyr. The best thing that could happen is for him to have a stroke or something. I mean the conspiracy nuts will still be themselves, but largely his movement will eat itself, at least in the short term. That's usually how cults work. It's very rare for them to outlive their founding jackass. I saw a dissertation once on how their replacement needs to be a charismatic organizer to reform it into a lasting movement, which is very rare.

Politically, JD Vance will be basically a puppet for the Republican party; he already lacks his own personality, ethics of any kind, and any kind of significant characteristics other than "opportunistic sociopath."