I thihk everyone agrees that cash is a hassle. But consumers are going to want to know why crypto is better than the fiat debit card they already have.
The advantage is to be able to hold and spend funds with anonymity. Or, spend money internationally without fees for fiat conversions. Otherwise, a fiat debit card works just fine.
This is a big deal though. The fees and bad conversion rates make fiat very expensive to use internationally.
Ditching cash for cryptocurrency will be gradual.This is because cryptocurrency should be fully grasped by everyone first in order to ditch cash.