Once a better solution has been found, the land can be freed for the nature to take over again.
We have no issues with stealing a couple of square miles of nature in order to pave it for our cities or to use it for farming.
Once you remove the wind turbines, the harm you've done to the nature was minimal: production of the turbines, used area and generated noise, minimal pollution of the area, the troubles of recycling them. That's mostly it.
You don't have this with oil, nor with current-age nuclear.
Also, we've already accepted the noise of cars, trucks, motorcycles and planes.
So I really don't get what they are protesting about, specially in Germany.