The problem with this is that there is now absolutely no reason for anyone to think that any treaty or other agreement made with any US administration (of either party) will remain in force after the next administration takes power.
Rebuilding any credibility internationally will require concerted effort by the legislative and judicial branches (and maybe states ratifying amendments) to rein in the currently out of control power of the executive.
And then the next trump comes in and reneges on all the agreements. Would take a few decades of stability as has been carefully constructed by the US since world war 2.
This is still very optimistic. The only reason this would work is that America's negotiating partners want to believe the change is real. The American people will remain roughly the same electorate that elected Trump (for a second term, after he incited an insurrection), so the danger will remain.
As long as we're Godwin-ing this conversation, Germany has publicly repented for the whole Hitler thing. Public, unified repudiation of Trump would be minimum bar for America to be taken seriously again. I don't see this happening in my lifetime.
Yes, I've noticed AfD and I'm terrified of the future. But America, particularly the American right wing, has not even pretended to repent. And you'll notice I said it was necessary, not that it was sufficient (ed: actually I guess I wasn't super clear about that. This is clearer).
