Getting an Uber is a simple concept but may be difficult to explain to someone 30 years ago as you would need to explain the internet, smart phones, apps, etc. What relatively mundane concept today (like hailing a cab) will be completely revolutionized as

Most of the time when folks try and picture a new technology they apply it to todays standards and often completely miss the mark.

There are many examples but the process of ordering an Uber/Lyft is one where the concept is very simple and understandable (hailing a cab) but may be difficult to explain to someone 30 years ago as so much technology has built on top of itself to allow it. (High speed internet, smart phones, apps, GPS, etc.)

What simple task today will be done in a completely new fashion in 2-3 decades as the technology infrastructure of crypto/blockchain continues to be built out?

Edit: Not sure why some are hung up on the Uber example. Its not the point of the post folks.