Well..I don't know about that. People being the contrary critters that we are. If I were to guess...The middle..those moderates that are left..will clump together and form a new Repubican party for a new 'right'...a more extreme Left will coalesce..and a 'rump' third party...will be the fate of the remnant of the alt/right. I don't see one party rule..not for any long term. The Democratic party has its own existential crisis going on, as well. Interesting times.