That's a good point. I'm a c# coder by day and it amazes me how uninterested my coworkers tend to be about learning anything outside of the c# ecosystem, and even then they are largely happy with what they know. To them the command line is something they left behind in 1984 and they shave far too often to want anything to do with Unix.

Although it doesn't really explain why Rob can't write a book rather than do video. My colleagues are just as uninclined to learn through video as they are through a book.