A lot of Sweden is already like this. They're a super cashless society currently. I have only lived in Stockholm, but a large number of places will not accept cash in any form. This is done for security and convenience reasons, and most Swedes from what I have seen seem to prefer and like this method. It definitely has implications of course... but none that seem to be bothering the masses.

Here's some info about it: https://sweden.se/business/cashless-society

In some countries, and I wouldn't be surprised if Sweden is one of them, it's a requirement that you be allowed to have a bank account. You can't be refused.

That’s very good to hear, from where I’m from (Eastern Europe) a bank account is very heavily linked to a current physical address (as in, you must have a physical address officially attached to your name which in itself is a quite cumbersome process) and oftentimes with an additional proof (like an utilities bill on your name attached to that address). That makes getting a bank account a little difficult for many people.