Blockchain technology will change the way the world handles things - not just banking. Concerning "traditional banking", I don't believe that it will be killed, it will just take another, weaker form, unfortunately.
Yes it is true blockchain technology has the high possibility that could destroy the traditional banking that's why a lot of banks out there participating here at cryptoworld printing as much as money as they can just to collect as much as they can the supply of Bitcoin and ETH. Right now they really aware what effect of blockchain technology can do to them.