Chill down. It's just someone who has a lot of experience in the field making an analysis of the current landscape of the career, using their own as an example.

> Telling people to stay away from graphics programming is not how to entice tomorrow’s John Carmack.

John Carmack was one of the _first_ graphics programmer to ever exist. The next John Carmack can't be in the same field. The same way we can't expect the next Beatles to be playing rock music. :)