There are hundreds if not thousands of real use case scenarios of cryptocurrency. What we sometimes forget is that some cryptocurrencies are already being used real life. Although we might not be using them but hundreds of thousands of people are already using them. 

Let me list some of real uses here:

1. You asked this question on musing.io, which is a basically built on the Steem Blockchain. Steem is the native cryptocurrency of this blockchain and we all get to earn Steem tokens as we use dapps built on top of the steem blockchain. We are basically getting paid for our time, on this social media - As real as it gets.

2. Smart contracts are basically digital contracts that are written as pieces of self exciting codes that follow a uniform protocol. Thus you are now able to make deals with even anonymous parties based on predefined terms of your contract. Thanks to smart contracts we are able to so without the fear of  miscommunication or misinterpretation or even cheating. Many cryptocurrencies have this feature built in and is used daily by many people.

3.  Border-less and faster payments: This means that you don't really need to wait for you transcations to be cleared by banks and government officials. You can use cryptocurrency to make peer-to-peer payments with any dependency on a third party like a bank (I have personally used it many times)

4. Tokens like BAT tokens are being used to incentive your work on internet. You create content on internet and use the built in functionality of of the Brave Browser to monetize it. Basically you get paid in BAT tokens for your work.