The hope would be that Trump would be seen as a one-in-a-kind terrible mix of both hyper-charismatic and negative, like Adolf Hitler

Very unlikely. He won twice and fully owns one of our two parties. Any hope for "he was an aberration" died last November.

As long as we're Godwin-ing this conversation, Germany has publicly repented for the whole Hitler thing. Public, unified repudiation of Trump would be minimum bar for America to be taken seriously again. I don't see this happening in my lifetime.