I don't think that's true at all, "if not Hitler then someone else", as if it was some kind of unavoidable deterministic fate.
Personally I will just be ecstatic over never having to hear his dumb fucking voice again.
The cabal of fascists infesting and rotting democracy like termites will have to be dealt with and if anything, at least our shared hatred of Trump has made us come together and organize and prepare to fumigate the whole fucking place.