Like the bazillion scientists (of their day) who swore the world is flat?
Apparently it is not true that it was generally accepted that the world was flat. Simple observation shows that it is not.
Correct. It's been known by the Ancient Greeks that the earth was a sphere. The flat earth movement can be dated back to the 20th century.
A better analogy would be the Aether hypothesis or the miasma theory of disease.