Why do you think that banks will close? What gives you a reason to say that? Do you know what is a bank? Let me remind you, after all, bank is a place that lets those who have a surplus of money to deposit and borrow it to those who have a deficit of it, i.e. it's a middleman that gives the lender a guarantee of profit despite the fact whether borrower pays money or not.
There are national banks (for example FED) behind the commercial banks, it's a huge system and cryptocurrencies and Binance can't abandon it and take place of it. First of all there is no way that can do it with their possibilities and resources and then - a small change in law and it's enough to stop the entire process + not many people will come to support it cause most of the population don't know about bitcoin or cryptocurrencies and if they know, a high percentage of them think negatively about it.
And stablecoins? They are pure shit, crypto version of USD.
On point!
This is why I think most people in cryptocurrency industry does not understand furtherly the system or the things they are talking about.
Cryptocurrency exchanges cannot become the replacement of banks nor a new way of banking. Specifically Binance, it is originally created as exchange, where people can buy and sell crypto assets, hold their assets there, overall trade there. Though Binance offers some kind of staking, apy defi things that offers more interest in banks, it does not mean it can replace bank. It depends on how you consider it. If you think Binance is a good place to out your money in, then so it. But remember, there are always a risks. Even Binance had a SAFU, it is an online website and it is vulnerable to hacks. What I want to say here is that do not put all eggs in one basket.
Banks on the other hand is not just a tool where you put money in there and done. No! If you don't know, bank also helps the economy in every countries.
Also to think of that Foreign Exchange is the largest marketcapitalization and volume traded everyday. And to think that Banks are the major players in the ForEx market.
Overall, there is still a lot to consider before you can conclude or in the near future, crypto exchanges will reolace banks. They will always be there, as a medium of trading but not as what the banks can do.