More diversity would be nice, but I don't think Fela Kuti would cut it. At least not for me. I've got a fairly eclectic music collection, but most of it wouldn't really belong in an adrenaline charged extreme sports video. You need something with energy to get you amped to go out and do it too. Definitely the first descent of an 80' waterfall deserves something that really rocks.
To use an example and artist that everyone knows, can you imagine using a Pink Floyd song as the background track to that clip? It just wouldn't do it justice. Of course, jazz is one of the few genres I have no interest in and I've only heard one of Fela Kuti's albums (zombie I think it was), so maybe there are some songs you have in mind that I should check out? I'm always looking out for new stuff to listen too.
Also got to say, I like the lyrics to that song they used. Anyone know who the band is?