I have never understood why people believe the Republican Party is finally going to "see the light" and liberalize after this election. According to RealClearPolitics, Trump is projected to win 241 electoral votes, essentially 1-2 states short of winning. Let's compare that with the last two elections.
John McCain got 173.
Mitt Romney got 206.
Both of them were considered the poster boys of moderate Republicans. For God's sake, Romney was once considered the most liberal Republican governor in America when compared to his contemporaries. And McCain was famous for being a moderate maverick who reached across the aisle to enact policy. Both got absolutely roasted in the general election.
Trump, despite being a demonstrably sexist, race-baiting, boorish, isolationist, economically-illiterate, policy-void populist... is slated to do better in the general election than the seasoned moderate statesmen of the last two elections. Think about that for a minute and what it means.
If this upcoming election ends up being a narrow loss for Trump, the GOP isn't going to hang their heads in shame and decide to suddenly become the Democrat-lite party. They're going to say "We need a version of Trump who has more public charisma". The party is going to double down on the ethnonationalism, isolationism, and social conservatism because there's rock-solid numerical evidence that this kind of Republican does better than the "moderates". But next time, they're going to pick someone who is more slick and cosmetically passes himself off better.