Cults always begin with a "personality", but it's the "all business" successors that really entrench the organization and have a more lasting impact.
They already learned not to lean too hard on his cult of personality from his first term, or rather, to use it most effectively as a distraction. It's why they drafted their vile Project 2025 counter-Constitution, so they could carry on doing the most harm once in power, with or without him. People are dismissive of seemingly nebbish weirdos like Johnson or Vance, but it is invariably those types of people who take the reins of power once the Personality is gone, and they stick around for decades, and do as much damage as possible.