Trumpism will continue though. Someone much smarter than me stated that anyone thing this is just a blip is an idiot. Not claiming you yourself are an idiot but US policy is unlikely to change after Trump. It may soften. But it will never be as it once was.
History going back at least a few decades suggests that if a Republican successor to Trump doesn't put his own ideological stamp on all foreign and domestic aspects of the presidency, he'll be approximately the first one not to do so. Even a former VP. For a Democrat to fail to do so is even more unlikely.
The debate, then, is "how much?".
It's prudent to assume that all politicians aiming for the presidency are smart enough to play "go along to get along" (except for the primary candidates just in there to raise their profiles for other reasons) until the prize is grasped. A useful predictive guide to where a politician is heading is his behaviour before he got to a position in which he had to go along. The truest Vance, for example, is probably Vance c 2016 about the time "Hillbilly Elegy" was published. TL;DR, he claimed to be a NeverTrumper, at a time when he could not foresee needing to be in Trump's good book. Is he a convert, or playing a role in pursuit of ends?
I doubt any future president is going to duplicate Trump's communication style. That change in tone alone will be huge. I also doubt any future president is going to duplicate Trump's on-the-bus-off-the-bus irrational changes-his-mind-three-times-a-day unpredictable policy habits. That change, too, will be huge.
With a future Republican, I expect import tariffs to go away and protectionism to revert to pre-Trump levels, driven mainly by Congress. Expectations of high contributions to international security and assistance, I expect to remain. Bellicose threats to friendly nations I expect to disappear entirely. And those three things are pretty much 90%+ of what matters.
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