Banking will never die. Just there will be a choice of conducting calculations:
1. In the traditional way through bank;
2. By means of cryptocurrencies.
Well and of course at cryptocurrency of an opportunity will be much wider.
There are certain things that banking could offer that isn't available in blockchain.
Like, cash loans as used as a capital for businesses or personal projects like home renovations, buying a new car and other services.
Although some blockchain are offering lending Cryptos to people but the local banks could offer more to their clients especially on KYC requirements.
Blockchain can replace the banking system but not fully. There are still huge gap between banking and Blockchain.