I think the network effect is highly overblown for the average person. Sure, networks can be good for the people in the top 10%, but I don't see it really helping most of us because what are the chances our average friends will be in a position to hire us to a high position.
I don't see an average developer being even a millionaire after a decade. Average salary is about $100k, but might be skewed due to the high cost areas. That's $1M before tax, living expenses, etc. Maybe you could hit $1M after 2 decades if lucky.