We don't use cash quite often now, we pay everything using credit cards. It seems that we are living in a card world. Everything is about card. Card equals to money. It is super than money, because we don't need to bring a lot of cash with us, we just need cards, they are more convenient than cash.
But there are still some problems with credit cards too. What if you hold bad credit credit cards? This was a tough thing a few years ago, but it is better now, many companies begin to provide solutions for such kind of cards.
Where will credit card go in future? Will it replace cash? It's quite possible. I hope so too. I don't like to always bring cash with me.