Maybe in the future there will still be a transition between the overall use of Bitcoin and FIAT.
So the older generation who are still stuck with using FIAT still has time to learn new payment schemes using Bitcoin or cryptocurrency.
the use of bitcoin will not be entirely accepted by the public for currency but to be an investment asset is very possible, so we only need to see the development of altcoins that will be directly in contact with the public for their needs, such as in web3 for example or other assets that can be connected to blockchain technology. I quite believe that all will not be disrupted, only certain parts can be integrated.
It makes perfect sense if web3 development could really touch users directly by using altcoins as a means of payment.
Maybe now it's simpler, like we buy goods without using paper money and more using electronics. either by credit or debit card and shopping card issued by each department store.