Yes, they will become outdated because of the technologies that are continuously advancing. If there's a will, there's a way, there are ways on how those PWD have an access to social media, there are people who are guiding or taking care of them so that those actions that they want to do will be possible for them with the help of other people. But not all, there are people who are poor enough to do that because of lack of money.
That's right it is just an alternative for fiat, but if you think of the future and the risks of getting harmed and the crime rate is increasing, would it be safe to use fiat? While in cryptocurrency, there is what we called security in wallets, by that it will help you to become secured and away from those scammers and hackers.
Using crypto is less hassle in many transactions, it will make you have faster and secured sending of money so that you will not be anxious about your money. The only thing in crypto is that there is a coin that is volatile in the market and you need to deal with it.