There was a Germanic pagan revival in the 19th century. It was variously referred to as Ariosophy, Götterglaube, Folktroth, Deutscher Glaube, Armanentum and a host of other terms. It is hard to estimate exactly how many people were involved since its edges were just as fuzzy as those of 'neopaganism' are today, but we can surely put a minimum estimate at tens of thousands. In a society that was still institutionally dominated by established Christian orthodoxy, that is a pretty remarkable development.
I don't think more is plausible. If 19th-century Germans needed spiritual fervour, they could get it from nationalism directly, without the intermediation of religion. Those who were religiously inclined mostly would have found it easier to stay within the bounds of tradition. And to most working people, the whole thing was just bourgeois being silly. If you could get working-class paganism going, you'd be on to something, but I fail to see how. It was never all that popular.