I'm learning WordPress and I'm enjoying developing sites. However the entrepreneur in me is wondering what other services would be in demand besides building sites. Maybe areas such as securing Wordpress sites?
Wordpress is widely enough used that you can do almost anything with it! You can manage others sites in terms of cheap hosting and managing their backend; manage Wordpress security; Wordpress specific consulting; create plugins that generate revenue; give talks on Wordpress; the list goes on and on!
If you become a Wordpress expert the sky is the limit!