Also, you could go back in history and say the same thing. 200 years ago most be people were "unintelligent" illiterate farmers, and yet today there descendents are literate, many doing highly intelligent work. The implied "genetic potential" arguments on intelligence are all wrong i believe, though i have no data to back it up.
Relative differences matter of course - there can only be one chess world champion - but most of tech or even finance is not in that winner-take-all space yet.
The parent commenter was speaking about making a transition in one's own career. Like him, I have doubts about my ability to become a top-notch violinist, especially since you have to find the tone centers by ear for that instrument. I don't know of anybody ever developing perfect pitch as an adult. Similarly, I doubt my grandmother, who even now is an extremely talented cellist with perfect pitch, could ever become a good programmer.
However, her son did become an excellent programmer, I am confident that my own children could become excellent programmers, musicians, visual artists or speakers of any language... if they start as children or adolescents. Yes people can change an learn... but drastic changes rarely happen after a certain age.
As for the latter point, I think the perception is that the 1% overall is about old-boys' networks, scamming, crony capitalism, corporate/government entanglement, and general under-the-table sort of business. Nobody wants to go into that; they want it gone.