It’s not just ideological or lack of authority, EU economy is deeply intertwined with US’s one: if your main ally turns his back on you, you’re in deep shit no matter what you do. I agree that harder times could be beneficial (other comment to yours), but try to survive Trumps legislation could also work. In my view, it’s the decades before this that prepared the field for trouble: both with Russia and USA, Europe has made itself too dependent on foreign countries (for energy and defense, core matters with regards to be strong on an international field)