China is the only place where national digital currency is going to succeed, well, maybe one of such places. We have examples already when a country use some other inside currency for business. Did you hear about Swiss WIR? I suppose China is plan to create something the similar for relationships between producers and buyers inside the country with some easy terms. If it is so that is really going to be progressive for all country.
I don't think China is the only place where this can succeed I am sure that some Scandinavian countries would have good results if they were to implement something similar like China. In China the majority of people don't use cash anymore in the supermarkets but they use alipay. If you don't know what alipay is, it's basically a platform like Amazon (you can order basically anything online) but it also allows you to pay for goods and services in let's say the supermarket. So this project will most likely succeed if they do it right.