From your linked article: "Where are the dark matter developers? Probably getting work done. Maybe using ASP.NET 1.1 at a local municipality or small office. Maybe working at a bottling plant in Mexico in VB6. Perhaps they are writing PHP calendar applications at a large chip manufacturer"
i.e. in Cost Centers not Revenue Centers, which is to say in jobs that do not pay well, and their management is trying to figure out how to spend less money, not make more money.