Mobile payment definitely will become the future. There are much more benefits compared to using cash.
Let us take China for example. The reason why mobile payment boomed is due to:
1. There are risks of accepting fake currency for cash
2. Everyone is using Wechat, you almost can't find someone not using it
3. It is made such that the platforms are linked directly to banks so transferring in and out isn't a hassle.
There are much more reasons.
With our technology advancing day by day, bulk usage of mobile payment in our everyday lives should be common. In the Crypto community, there are lots of companies focusing in the transfer of fiat to crypto and vice versa. It definitely beats the stack of cash I keep in my pocket and being cautious in a crowded area.