I think in my country it will not happen to phase out physical money even there is already a digital money or credit/debit card. Not all knows how to use cashless method and it is a long process. Not even have a good internet connection. There's a lot to consider before phasing out physical cash.
Many government were dependent in physical money, and not all is able to adopt in technology many part of my country is still living traditionally without the use of Internet or any appliances that are operated thru Internet, even electricity sometime were lacking. So implementation of no physical money will be impossible to do, it will depend on what country we stay if they are already accepting not physical coins butt not maybe fully operated as every country still needs some physical money due to our elder people who may have problem adopting in these advanced technologies.