Earlier quoted context omitted.
> Github is probably one of the biggest innovations in web since Google. I love GitHub as much as the next guy, but 99% of Internet users neither know what git is, nor have any need of it. There are a little more than a million users. (EDIT: well no, there are now 3 million.[2]) By contrast, Google is used by over a billion people every month.[1] [1]: http://www.statista.com/topics/1001/google/chart/899/unique-... [2…
Innovations in infrastructure are usually unknown to most of the people using that infrastructure--until they fail. Think of what would happen if Github was down for a week: how many users would now have the name "Github" on their lips (probably with a negative connotation) after some web service they do use said "sorry, the fix on that showstopper bug has been delayed a bit; Github is down, you see."
Your theory doesn't hold when comparing github with infrastructure everybody uses but few people know about, just because its used by many people that write programs that are used by many other users doesn't mean it's an infrastructure like an Internet backbone.