I do believe you will see the end of the republican party if states like Texas and Arizona become blue states, which is inevitable. What I'm getting at is that I think extremist parties will arise that will gain political power and attempt to break up the Union.
I don't believe that social conservative whites in the South will simply go with a reformed, 'Corporate only' Republican party. I think they'll diverge into separatist parties. I don't think it will go smoothly like some predict. The North Eastern GOP and Jeb Bush's don't seem to realize this. I think it will be amusing to watch them come upon this realization. I think there's a lot of hard knocks in store for the 'Corporate Wing' of the modern GOP.