So was Einstein's and Copernicus theories.
Einstein's work was never considered pseudoscience by those knowledgeable in the field. I really wish people would stop repeating this myth. Relativity theory was groundbreaking, to be sure, but both special and general relativity were widely accepted within a few years of publication because they so neatly solved so many problems which had been bugging so many physicists. It seems we're so wedded to the story of "great scientist mocked by his peers but vindicated by history" that we tell that story about every famous genius, even those to whom it doesn't apply -- while, sadly, nearly forgetting many to whom it does, including Wegener.
As for Copernicus, the idea of "science" in the modern sense didn't really exist in the 1500s, so "pseudoscience" didn't either. The objections to heliocentricity, and to the nature of Copernicus' investigations, were entirely religious in nature; scientific debate, as we would understand it today, never even entered into it.