Herd those assets into accounts where they can be accessed with 'the chip', be it in a card, a phone, your hand, your forehead, and you can be charged transaction and service 'fees' which will effectively amount to negative interest rates.
In a time when the $500 bill should be making a comeback, and the $100 is the new twenty, making people carry a wad of smaller bills if they want cash will make them easier to target for robbery, be that done under color of law or just ordinary thieves.
As the Brits would say . . .
Hear! Hear!
In Viet Nam where the unit of currency is worth very little, there is very little theft of cash. It is not worth the effort. Children walk around with impressive looking wads of cash in their hands and no one tries to take it from them.