Whatever happens in 4 years significant damage will have been done. On the assumption the Trumpton era is rejected, that it could happen has demonstrated to the rest of the world that it can and does happen and thus the US is an "unreliable" partner. although early days I suspect the rest of the world is looking for reliable partners. What does the US do and make that we cannot source elsewhere? Countries will be looking for trade and alliances with countries who prove more reliable and not subject to 4-year madness impacting them so badly.More likely is that they will cause enough chaos and damage to be rejected (again) in four years.
Of course moving away from the US will be painful and expensive for the rest of the world but it's an "adjustment" clearly necessary so maybe best if we just accept it and get on with it, making our own plans for and with partners who are more reliable.
Ian