In my lifetime I doubt that cash will go away, even in the highly developed countries that I've lived in. In the US and Europe it's used in smaller transactions

In my lifetime I doubt that cash will go away, even in the highly developed countries that I've lived in. In the US and Europe it's used in smaller transactions, like a concert or dance event, where paying with card is significantly slower than cash, and beyond that you can definitely find cash only places, especially outside of a major city. If you travel outside of the US or Europe, many places deal only with cash, like Thailand or central Asia. I know that it's posited as better against corruption, but there are still some people that don't want a bank account and would prefer checks/cash for their pay and I don't see that going away anytime soon unless it becomes illegal (which won't happen).