That sounds improbable. If US currency falls every western economy falls with it

Improbable is probably how a lot of citizens of countries have felt in the past before their savings lost their worth. I'd rather us not be risking it at all.

So what is the action plan?

How does that make it improbable?

Not true. EUR and GBP will thrive.

How? When 2008 crisis happened the whole of west went down with the US

That was when the US was tightly aligned politically, economically, strategically at every level from national security to economic liberalism, with the rest of the West.

For years it was a given that the UK and Europe needed to buddy up to the US. That's not the sentiment any more, because the next four years feel like that's the wrong direction, and Ukraine is about to fall and that's the priority.