Bitcoin will never make banks disappear. That is impossible. There are only 21 million of bitcoins in the future. That is the maximum amount possible if i am correctly informeted. So if everyone in the world should be paying with bitcoins, we should all have very very very small amounts of bitcoin. That is impossible. I Believe in bitcoin as another value with which you will be able to pay all over the world, as you do with doller, yen, pound, euro or so. All the values will have there own life as now, and nothing is going to disappear.

Well bitcoin can't really make bank disappear , i mean the idea of having wallets and only paying with your wallet address when going shopping or just simply buying coffee is really awesome and sounds really cool but if things gets digitized so as the banks i mean if the world starts using bitcoin all over the place banks will adapt and start using bitcoin instead of fiat . 

Banks won't get disappear, even if the entire population of the world accept bitcoin banks still continue to be used. Each has difference in the convenience, bitcoin is better for the user who is technically advanced and banks were preferred by common people who depend someone for financial services.

Bitcoin being limited is good. Scarcity gives value and if there was more amount of bitcoins in regulation right now, then the price of bitcoin would be different. There's no currency that has unlimited supply. Maybe if there was one, it would be fiat. Seriously, your balance in the bank is just a number. The government can easily adjust those digits.

People always say that bitcoin is banned in "certain countries" or in some countries but never bothered mentioned what countries are those. The government can't control whatever you want to do online. They might possibly track you down but they would never have control of your activities.

Well, I feel that, at this time bitcoin still do not have the ability to make the bank disappeared. I feel, at this time the bank is something greater than the bitcoin. besides, there are many advantages of the bank in terms of transactions, storage, and others.

By the fact that it is already a business that has been here for many decades, the banking system has several advantages over Bitcoin with respect to places to use it.
However, with regard to technology, Bitcoin is far ahead of banks, the problem is that the number of people who are aware of this is still limited, but history has shown that the best technologies are adopted by people over time.

It is perhaps worthy of an answer. I understand that bitcoin is not enough functions. But he has a right to exist. That's only to deceive users with it not worth it.

I do not think banks will disappear, but there is no doubt that their business model is outdated and will be forced to evolve in a big way, and that is why we are seeing them make significant investments to in the development of institutional "blockchains", although perhaps they are arriving a little late to this innovation.

That's true if they will not upgrade or evolve to new generation like bitcoins the people who using banks will decrease because they will switch into bitcoins because bitcoins has many benefits unlike bank accounts or credit cards.