the question should be either can Blockchain help xxx to replace banks , or can Blockchain replace banking
and the answer would be no , at least not at the current stage of its development
while distributed ledger is widely used nowadays , it has its drawbacks if we speak about banking in its fullest
blockchain does allow a faster processing and cheaper transactions ( ideally )
but the infrastructure is simply not ready , the idea of multiple banks adopting one and the same blockchain implementation is close to zero
lets get back to this when banksters develop one global payment infrastructure , before that it is not possible for blockchain to overtake the banking world
Why no? Banks already started with implementation of blockchain. After 10 years of life bitcoin is well known to many, and popularity is growing. But while they are trying to implement blockchain cause with blockchain technology they can have faster and safer transactions, here we talk about decentralization. Its a concept, and even thou many people don't understand what that means, that will unite people around the world. We can work together, we don't need third party services controlled by banks or governments.
My opinion is that banking sector is in the problem! In near future people will turn to crypto, they will learn about crypto and people will have a choice to use centralized or decentralized services. What you use its what you support, and when you do the math its far more better to support decentralization!