Credit cards and fiat money will never disappear, maybe will just change forms. Bitcoin has shown the world the potential of crypto-currency and blockchain but it just might as well remain an investment asset.
That's why we see that, more and more, countries and various private businesses are developing their own crypto. That's unleast how I see the future of "future" alt-coins. They'd be developed as a kind of "coupons" that you an cash in for various cost deductions or whatnot, therefore that coin will remain within the business.
Never say never. Nothing lasts forever and that applies to credit cards and fiat money. There will be a chance that they will be replaced by a far more superior form of money. It may no be bitcoins or other cryptocurrencies but it is possible. As the world is transitioning to a more digital and electronic way, then fiat will not be as what it used to be.
Fiat and credit cards are so engraved into todays society that it would be very, very hard to stop using them, similar to fossil fuel. Well crypto-currency seems like the most superior form of currency so far, what can top it? The fact that you only need simple qr code to pay/recieve and no need to carry anything else is a great advantage, among all.
As the world is transitioning to a more digital and electronic way, then fiat will not be as what it used to be.
That's why I've said that state developed crypto, backed by something, will most likely replace todays physical money.
