I don't think Chris Dixon is necessarily saying that founders are better, more worthy people than non-founders. I think he's just saying that being a founder is super hard.
I agree with you that there are many paths to happiness :-)
Let's say you got laid off from GitHub - would you pursue another equally-rare company, or then try to found your own?
Depends on what opportunities were out there. I'm not opposed to starting my own company, I just don't think it's the only way to happiness.