Most countries are still underdeveloped; having no physical currency right now will be a real problem. Maybe in the near future this problem will be resolved but it is quite difficult to actually solve this problem. Physical currency has its advantages; you can give money to a poor orphan you see pass by; obviously he won’t have any means to access the bitcoin currency. If it’s possible for something physical to represent bitcoin and be exchanged for bitcoin without any hassle then that would be quite good.
there are some, such as opendime, but they're not useful for giving to the poor because buying those usb keys just to hand them out to strangers will be too expensive.
I never have thought of something that bitcoin can possibly have a physical representation. That gives an idea and it could possibly happen in the future. If that so, then bitcoin will rule..