I don't see RoW ditching US market any time soon. Considering US has technological lead, reserve currency, workaholic culture, giant capital, reserves of raw materials and large population the only country that can challenge US is China. But China is reliant on US.
Civil War is just not in the cards, and nothing unites Americans as much as a challenge from outside. So I predict that after four years of turmoil and incompetent governance Trumpism will be abandoned in favor of more traditional Republican party or Democratic party.
Europe should become more self sufficient and less reliant on US so that it can at least defend itself or else it risks being quickly overrun by Russia if it manages to defeat Ukraine. So far Europe is too slow at building up its defense as it is overly beurocratic and spending on defense and building up military is not exactly a popular or easy thing to do.