Beautiful. There's a bit of poetic justice in this.
Programmers have been callously obsoleting various careers (and thus people) for decades now. In fact, it's likely that programmers are currently hard at work trying to obsolete careers that your little sister may already be considering!
It's wonderful that the programming field is about to get disrupted. Wonderful! Programmers about to see their skills become as common as basic reading or writing.
Programmers, fear Codecademy. You're about to taste your own medicine. Expect your irrationally high salaries to drop — that's justice.
Love the site, guys. Keep it up. :)