It seems to me that nothing can replace using clear, understandable and convenient fiat money. Also, cryptocurrencies and all that digital stuff make people beware of them and push them away. What are the developers expectations based on?
Cryptocurrecneis have problems only with legal status and unavailability for some part of population so far. When the Crypt2Pos appears, such payment method will be widely spread as an alternative one in the near future.
But anyway the POS terminal is necessary for this. And youre still saying that everything becomes more available