I share your idea of a national digital currency like Ecocash but running on the blockchain but our central bank providing the system it is a hybrid system between the fiats USD and bitcoins that allows formalisation of the blockchain system.The good thing about bitcoin is that it is deflationary.Watch what Japan has done: adopting bitcoin as a formal currency .This is because it will skyrocket their economy when bitcoin is going to be worth 13000USD end of 2018 .such a parallel run of currency gives us leverage.If Zimbabwe would see the technical advantages we would do something.