You say that but where are they going to align themselves to? China? The US benefits by having a lack of good competition. Things would have to get extremely bad for the rest of the west to dump the US. Word on the street is that Trump is going to announce a run for 2024 as a way to get ahead of his rivals. He has a reasonable shot at winning barring unforeseen circumstances. You can't dismiss the odds given how incredibly poorly the Democrats have messed up their two years since taking office.
I feel that if given another Trump win, the rest of the west will be forced to remain in another holding pattern for four years and suffer whatever consequences occur hoping that four years later things improve.
On the short term that sounds about right. Still I would guess that if the EU and US relations would go from more of a culture friendship to a strict transactional nature that would have big consequences. The EU would try to be more self sufficient and for one import less from the US. The EU would probably try to find closer relations to countries with semi big military, totally guessing here India, South Korea, Japan, Australia, New Zealand, Turkey. NATO would of course start to look more shaky and the idea of an EU army more of a possibility. Maybe even a new NATO would form without the US?
I could see the EU being more self sufficient. But at the same time it will be difficult given that they have a serious population decline. You need that population to grow the GDP. Furthermore some essential industries seem to be completely abandoned by the EU. (Looking at competitors to the FAANG companies).
>The EU would probably try to find closer relations to countries with semi big military, totally guessing here India, South Korea, Japan, Australia, New Zealand, Turkey.
This is assuming they have the capability to project forces anywhere in the world which given these countries you listed, feels unlikely either now or in the distant future.
I feel that if given another Trump win, the rest of the west will be forced to remain in another holding pattern for four years and suffer whatever consequences occur hoping that four years later things improve.