The Legend of Korra

On Airbending: "The "Avatar Extras" stated that all Air Nomads are airbenders. This would make the Nomads the only group with every individual being a bender. The creators also explain this is due to bending coming from spirituality."

 Spoiler

>Obviously.

>I'm fairly certain there's no need to raise her foot in preparation for some sort of death strike to just remove her "shoes." If anything, she does it to hit the ground for more vibrations. That is the opposite of what Toph did as she just felt all other vibrations rather than creating her own (except that one time she was in a metal box).

>Does that not apply to all minor characters in movies/books/shows? "They could've been a major player if only ________."
To be honest, I didn't even think whats-his-face of the opposing Pro-Bending team was that great. Because he cheated so much, it gave him the illusion of being superior. But really, I'm certain in a pure waterbending duel, Korra would've won.

On Toph: I'm sure there's all sorts of exceptions. Because Toph is blind, she has similar conditions to Badgermoles so that may have given her some sort of boost (?) to just learn it naturally. Again, Aang's family is probably the biggest "evidence" that bending is genetic since one of his children is a Waterbender, the other an Airbender, and the third a non-bender.

Oh I didn't know the Avatar Extras thing mentioned that. I tried to avoid it because it mostly gave useless information or spoiled things for people who haven't seen it all yet.

 Spoiler

Except that many times Toph had to touch the ground with her hands to detect things, to sense hidden structures and the like. She didn't just stand there and go "Oh there's tunnels down there!" She used her hands as well to gain extra sensing.

It doesn't really ally to all minor characters in movies/books/shows. Most of the time they are not forcibly removed of their abilities, they just choose to go separate ways.