Ultimately all of our opinions are just one more point of view, and every statement is probabilistic. The near sphericity of the earth is a POV with a very high probability of truth. If all Wikipedians (and we are many) hold that POV than the NPOV will also be in that range as a consensus Why would it be necessary to add that qualification if no-one is disputing the shape?
So, your answer to my question: "How many fundamentalists does it take to make something controversial?" is "One. As long as she's a Wikipedian."
Or am I reading you wrong? :)
Regards, Haukur