That is actually true, as you can see the world is gradually turning into a digital world where everything is done digitally Including payment system. Online payment system has take it shape in another dimension which has reduced the risk of being rubbed physically. Although this phenomenon does not mean that physical cash is not important. It's important but it has limitations to its usage for example booking a flight, payment for grocery shopping, making an international transfer. All this requires you to pay with debit/credit card or cryptocurrency so not in all cases that cash is needed so we have to embrace the new revolution.
Money - both digital and cash depends on what both parties chooses to exchange for goods. They are some businesses that shouldn't show no trace, so people in that transaction will prefer cash. And since it's available the business will go fine. It's just like more people are now into digital transactuon that they forget how huge cash still circulates in the physical market.