I definitely think it is possible to live your life without having to pay cash. Look at this fictional story by Cryptowisser showing how you could go about living your life without ever having to carry around a stack of cash or a normal bank debit card:
https://www.cryptowisser.com/cryptocurrency-merchants/
Do you think the story (which is fictional) could reflect a day in a non-fictional person's life?
/Tristan