Consumer tech in the 21st century has made it easier than ever for the average individual to delve into the deep, dark corners of their hobby or fandom. Every episode of your favorite TV series, the latest breaking news about your obscure hobby, and discussion forums about your every interest are at your fingertips 24/7. Pop culture is leading the way in the decentralization of our social consciousness, as individuals drift away from a homogenous "mainstream" and toward 1000 different specialized echo chambers. Even something as basic as your primary news source is often tailored to your specific political beliefs. (See: FOX News vs MSNBC, Drudge Report vs Huffington Post, etc.)
Delving so deep into any particular interest took far more effort 40 years ago, so "geekdom" was a much smaller crowd made up of individuals with a particular drive and focus.
My perception--take it with a grain of salt--is that individuals increasingly see the seeds of geekdom within themselves.