Just look at denmark and the app MobilePay

It´s connected to your creditcard and you can pay anywhere with it, with your mobilephone. Even the homeless now have a sign with their code or phonenumber for mobilepay, as people almost never have coins anymore.

Yes I think we will see a huge portion of cash been digital.

Thats why I have started buying silver, and when I earn more money, I'll also have physical gold - It´s fun and interesting with digital cash, but I do fear something unforseen act.

Let´s just take the news these days: North Korea bombs Japan in a few years from now - China and north korea employs all their hackers to disprut the west, and a war begins.
If we are unlucky and most of our cash is in a centralized system, it might very well get frozen.

Well - I guess it's always good to putt your eggs in different baskets