I think people would invest more time in self-development if they didn't spend so much time on their "image" on Facebook etc.
We live in a time now where the outside is so much more valued than the inside, which is one of the reasons why people don't learn after they leave school. They are simply not motivated enough.

Another main issue is that the mainstream music is easily consumed, which therefore also make people used to easy things.

Self-development takes time and many hours of thinking, in some way it is the difficult path, while listening to Rihanna and repeating yourself over and over again is easier.

Once learning was a privelege now it is a duty that people look forward to leave behind them at some point in the life.