1. That at an early age, programming role models in particular aren't as important as STEM role models in general. It's certainly anecdotal, but I moved towards programming as a practical job that somewhat satisfied my broader interest in science and engineering.
2. It might be beneficial to girls and boys alike if technology was taught more socially. Certainly tinkering and reading alone is important, but maker clubs and the like are an extraordinary way to get young people involved. As a bonus, they help with teamwork which is another big issue for (many) tech companies.
He'd be the last person to tell you his observations and this anecdote should be seriously used as a citation to lend yourself weight in an argument about the source of gender bias in tech.
As for the Role Model aspect in particular... It's actually difficult to provide citations, because it's so commonly accepted in the community. I attended Grace Hopper '13 last year, and it's just recognized as a given. When I go through research papers from the past 5-10 years, they start off by just recognizing that its a known problem and then move onto subproblems or their new solution. Unfortunately, I don't really have the time to go mining the work that led to this problem being recognized. Still, I can recommend a book, "Unlocking the Clubhouse" http://mitpress.mit.edu/books/unlocking-clubhouse which should cover this!
https://en.wikipedia.org/wiki/Ada_Lovelace https://en.wikipedia.org/wiki/Grace_Hopper https://en.wikipedia.org/wiki/Limor_Fried https://en.wikipedia.org/wiki/Jeri_Ellsworth
And many more. If these women aren't role models enough, how is me investing multitudes more of effort and hiring one or two female engineers at a small startup going to create role-models.
I believe in investing in the egg as you call it, by getting women interested in tech at a young age, we can have more candidates to choose from and then not have to jump through all the efforts and hoops this website want's me to do. I see no practical reason to reword all my job postings and hire a female-centric recruiter when I can just hop on angellist for an hour.
It's actually difficult to provide citations for the obvious problem of lack-of-role-models, because it's so commonly accepted in the community. I attended Grace Hopper '13 last year, and it's just recognized as a given. When I go through research papers from the past 5-10 years, they start off by just recognizing that its a known problem and then move onto subproblems or their new solution. Unfortunately, I don't really have the time to go mining the work that led to this problem being recognized. Still, I can recommend a book, "Unlocking the Clubhouse" http://mitpress.mit.edu/books/unlocking-clubhouse which should cover this!
To say nothing of how hostile the industry leadership can be to women (cf Richards/SendGrid, GitHub, Tinder, Urban Airship).