The rightist party is the natural home for nationalist sentiments within a country. I expect the Republicans will find it increasingly difficult to deny reality and pretend it is still 2004, when in fact the world is much different. People are sick of war and the domestic situation is dreadful. The energy is going to be that of a more inward focus.
Regardless of what Trump's margin is, there will be Republicans eyeing his message and path and will offer a similar pitch to try and get the Trump vote in the primaries, whilst avoiding Trump's personality and controversial statements.
Are you talking about changing the Republican platform to include Trump's agenda items, such as leaving the safety net alone, extending healthcare (somehow), anti-trade, ending opposition to social change, etc?
If so, that kind of platform change won't happen immediately, even if they try to make it look like that is what they want to do. I imagine candidates further downballot will play with those positions, but national/Senate campaigns will be slower to adopt due to donor/activist issues. If they try to concede their fight with social issues, they will upset the value voters faction and inevitably lose some grassroots support / money. If they try to reverse on supply side tax policy / trade / regulatory policies, they will lose some monetary / grassroots support from people like AFP.
Republican leaders were not clueless to the fact that their voters wanted different things. They knew this to varying degrees. They kept a platform that went against their voters interests because the Republican establishment sold out to deep-pocket donors and other conservative groups. I wouldn't be surprised if they lost the next 2
(20'/24') presidential elections because they were unable to cope with an ever-diversifying electorate that increasingly didn't buy their bs.
All this on top of the fact that a lot of other conservatives in the party oppose various parts of Trump's agenda on ideological grounds.
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