Trumpians are Trumpians even without Trump — It is a discriptive term of behaviour!
Link to listing of traits of a Trumpian even without Trump — Traits of a Trumpain
If Trump were to be removed from the head of the GOP and leading Americans who follow him, there would still be Trumpians and Trump Wantabes who would STILL have the same behavior, concepts, and aggression. The result of their actions would still be the same destruction and danger to democracy as we know it.
This fact does not remove responsibility from Trump for his actions and creation/pushing of lies which enhance the aggression of his followers.