Suffice to say in the next 50 years, our money supply of cash, coins, and paper money would be a thing of the past. The increase in the clampdown on cash, and undocumented economies, and forcing (or migrating) everyone to the digital economy means that at some point in time in the next 50 years, money that you can physically keep in your hand or exchange would cease to exit and not be convertible or recognized.
It would be much easier, efficient and trackable to use digital money versus physical money.
It is easier to move electrons than atoms!
If you look at Star Trek and read Gene Roddenberry, in his future, there was no money per se.
We are in the midst of that change, becoming a cashless society. Our economies are slowly morphing into the digital money