Nowadays bitcoin is connected with banking process. If bank not available. People can't change Bitcoin. So coming future it possible for changing this process. Kindly any one explain me. I need to know. Kindly support and give your adivoce. Nowadays banking is connected all country people and change the all country's currency.
You probably don't even know how bitcoin or most of the crypto currencies work. You should start googling and learn about the basics of crypto currencies. I haven't heard that bitcoin is being connected with banking process. Even if it is, you don't have to use the currencies centralized way. If you do use "the centralized way", then yes, you won't have access to your coins the their services is unavailable.
If you decide to use bitcoin and not store your currencies in centralized exchange or institution, then you will always have access to your coins. You can sell them whenever you want through P2P trading.