One thing's for sure though, they (cryptocurrencies) have shaken the foundation of money as we know it, hence even why bankers are thinking of making the switch into cryptocurrencies. It will take a while before we see crypto being issued on banks, but I think it is the way forward for our society. Also, I don't think this is a sign that bitcoin or any other decentralized crypto will take over, it's just that crypto will just be prevalent in our society and there is a possibility that bank-issued cryptos will arise.
I believe that we are in a situation where it is totally possible to actually have a cryptocurrency world, where a person can live with only crypto without ever living with anything else.
Right now, that is handled by exchanges that have cards as well, it is not a credit card, it is a debit card that you can use with your crypto, so you have 10k+ dollars in your exchange account? You spend 20 bucks on a meal somewhere but have zero dollars on your exchange account? That's fine, it cashes out 20 bucks worth of bitcoin from your account and pays it, that way you are always at 100% crypto without ever going to fiat and can pay for everything with it.
This is why I think the world is getting a lot closer to full-time crypto, and this will hurt fiat a lot, think about everyone trying to sell and get out of fiat world, that will devalue fiat a ton more, and that is good for us because crypto will be worth a ton more as well.