Next election will make this one look tame.
I mean, it's possible, but it's hard to believe something like this will happen again, much less the next time make this "tame." I think the GOP is going to take some steps to make sure another Trump-like candidate doesn't make it to the primaries, like I legitimately expect there to be behind closed doors discussions with candidates to make it clear that if they act anything like Trump, or create their campaign remotely like him, they will not be nominated by the RNC and will be replaced. The GOP is also going to be pumping a lot of anti-Trump stuff once he loses, attempting to severe themselves from him, and sour the non-alt-right to him as much as possible.
I know that some of that probably shows pseudo-conspiracy theory and all, but one thing this election is proving is that you can't hope to win a National election with this type of campaign. If Trumps loses by the amount he's predicted to lose by as of now, even in this highly polarized political state of America, the GOP is going to make a real effort to try and paint themselves as 'not really like Trump, we promise.'
I'm not saying that the GOP will change like it should, especially if they remain significant in congress, but this election is definitely a clear indication that you just can't be an open piece of shit and hope to win. Even if you are a piece of shit, you still have to apply to the moderate center that Trump has totally alienated. Trump is going to be a really toxic wound for the GOP on a national scale, and I actually think 2020 is going to be a real attempt to try and bring the rhetoric back to that center, even if not the policies and whatnot. Which makes me think Ryan 2020 is pretty much a sure thing, since he's exactly the kind of person who can carry that idea.