Maybe none of us should be building anything. The facts are pretty strong toward that one, as well, and most readers building a company would have a much safer path coding at Microsoft.
It just doesn't matter. Did you know Fermat was an "amateur mathematician" and Wikipedia introduces him as such, after giving his introduction as "a French lawyer."
So what? Was mathematics a waste of his time - certainly. Would you have advised him not to squander it doing that? Would you have told him not to actually study mathematics formally and devote his profession to it? Who knows what we could have gotten.
Thankfully these arguments are never going to affect the bright minds of our or any generation, and people will go and do whatever fascinates them.
Planck, too, was discouraged from studying physics:
"The university's professor of physics, Philip von Jolly, discouraged the young student from studying physics because—as Jolly told him—it was very nearly a closed subject with little left to discover. Luckily, Planck disregarded his professor's advice." [1]
Basically that's all you need to know about the current blog post as well :) :)