I agree.
It's a way to assert dominance and the EU countries are partially responsible for the state of things.
I mean, when you outsource your manufacturing capabilities to China, your tech services to the US and your security to NATO, then it frees up a lot of cash to spend on other things and that is probably why life in the EU is pretty good.
Unfortunately the other side of this coin is that it leaves you completely unprepared if/when things change quickly.
> Europe has a decade or two of hard work and crippling costs
Once again unfortunately, many EU countries are already maxing out their budgets each year and running sky high deficits so there is not much dry powder to absorb these costs.
Raising more money through taxes is politically unpalatable when a lot of the EU countries are already in the top 10 of most taxed countries on the planet.
The only notable exceptions are Poland and Germany but they won't be able to carry the rest of the EU by themselves.
> maybe even split the EU into two factions of American-bully-reluctantly-aligned countries vs American-bully-righteously-andor-selfservingly-opposed countries.
The smallest EU countries have no choice. There is no EU army and therefore if the US leaves there is no one to replace it. It's a basic case of choosing the best worst outcome. Become a vassal of Russia or become a vassal of the US.