The author lost me at "Mathematical genius resides within every one of us — most people just don’t know it yet." The movie Ratatouille captured the sentiment much better, "a great chef can be anyone". Which is not the same as "anyone can be a great chef". It seems the author is mixing up those two. I fully agree that gender, background, schooling, etc is not the key determination of genius. However, saying anyone cou…
A 7ft tall pro basketball player resides within every one of us.
With all due respect, what you say is a consummate example of "dangerously bad idea that makes a good sound bite". Most mathematicians out there are not Hilbert, Gauss, Riemann, or Euler. They are reasonably smart people that work hard over long periods of time to learn their craft and their field, and make incremental progress in the niches they specialize in.
Most people can be productive mathematicians, they just don't believe in themselves.