That is a big change and I expect that it will continue. Despite this, the stock of banknotes on issue has continued to grow over recent years. There is nearly $ on issue for every Australian, including 18 $ bills for every man, woman and child. I don't have my share and I don't know many people who do.
The RBA is also investigating new forms of digital money, including a central bank digital currency. It is too early to tell where this will end up, but history teaches us that the nature of money changes with the available technology.