Eventually it will die out/splinter. It’s a cult of personality and celebrity, not policy. Yeah there are wannabes out there like Vivek but they come across as phony imitators. As said earlier, there are hundreds of thousands, perhaps millions that would actually give their life for Trump (or say they would - most of these people are wussies). I don’t see them doing that for someone like Vivek. Don Jr? Mypillow guy?
There will eventually be a vacuum at the top and an ensuing power struggle which will splinter the die hards.
Some of the policy will remain in the post-Trump GOP, but the traveling circus and rallies will die out.