That’s not “all he needs.” Trump’s support is collapsing. He is deeply unpopular. He could live forever and it’s not remotely clear he could stay in office. And Vance wouldn’t get the support of the sycophants. Every time he opens his mouth all human beings want to punch him in the face.
Vance has the support of the billionaires and while he's extremely unlikable, he's smarter than Trump and just as evil. Also Trump will do what he wants to do no matter how unpopular he is. Everything being done now indicates Trump doesn't plan to leave. I don't have faith in fair midterms.
Respectfully, that’s doomerism. States run the elections. It’s much, much harder to do something to steal them than anyone would have you believe. And Trump will do what he wants, sure, but he keeps losing in court and the people in the government aren’t all convinced they can just ignore that.