I believe that the main reason for not having more cryptocurrency courses is simply because it's too new of a concept. There isn't enough  research done and as well as empirical data, something that the "traditional" research is based on. Professors etc do not have the ground and the decades of knowledge that other scientific disciplines do have. Keep in mind that in order for a course with fundamental  knowledge to be built it needs to have a backbone of theories examined through experiments, to have evidence of real life. As of now we are still not sure why Bitcoins show such a volatility. You can argue it's demand and supply. What exactly drives the demand is still to be examined. Anyways, I'm sure more courses will pop up apart from the usual introductory ones such as "what digital currency is?". There is a ton of info that surrounds this topic which makes it so interesting. From behavioral economics and basic economic laws, to programming and investing portfolio theories. The field is just so vast and has yet to be explored. Over and Out.