And my point is that it's a label on a cyclical trend

Not so sure about that. Romanticism isn't related to Millinarianism conceptually or otherwise. The former was a re-adoption of a hollistic medieval stance on life and nature.

If you mean "some cultural things change every now and then, so a trend changing is nothing new", maybe, but it's a much smaller claim than that we see a rebirt of Romanticism specifically.