Your opinion is correct, we don't know what will happen in the future. Blockchain technology is currently still in the process of development, we will never know what stage the development of blockchain technology will reach. If the development is getting faster and it is considered ready to replace the old banking system, there is a possibility that the government will start to change its mind and accept that blockchain technology will replace the old banking system. But if we talk now, it is definitely impossible to be true. Because the government still feels comfortable with the old banking system. Therefore, there are some countries that still reject cryptocurrencies, because they still consider the old banking system to be worth maintaining. then fear that accepting cryptocurrency will replace the role of the old banking system.
I think we can "sort of" guess what can happen in the future. Blockchain is not the way to go, it is so easily traceable and the fact that politicians basically just do illegal stuff in the world and get away with it, being in blockchain world will not help them at all. Let's be honest being a decent good human being who wants to better every human in the world is not a way to become a politician, unfortunately anyone who is like that usually ends up not winning everything, people literally run against that feeling and get elected, saying "I will help everyone" is a bad thing, seen as a bad thing and others who say "I will help certain people only" gets elected.
This is why blockchain would make all those crimes politicians who are bad and do bad things come out into public and people who are in power who have the only right to make that switch will not allow that to happen.
Your opinion regarding the current political situation where there is a lot of corruption is indeed reasonable. Dirty politicians who are elected really
want illegal activities to be untraceable, therefore they still need a banking system. Because the banking system is much easier to manipulate
by dirty politicians nowadays. While blockchain technology, which makes it easy to track financial transactions, makes some politicians
uncomfortable with it. In the end, it is impossible for blockchain technology to replace the banking system, especially in countries with
high levels of corruption.