In future if bitcoin is allowed in countries around the world and most online based companies will start to allow bitcoin as their payment currency/gateway/exchange. But what do you think if we would be allowed to transfer our money to our bitcoin wallet from our bank accounts like PayPal does? Will it be a good thing for banks and us?
I think that in the future the banking system will not change. There will be more features, including buying and selling cryptocurrencies with a credit card, or banks will offer cryptocurrencies as a tool for investing, but in general everything will be the same.