I think in the future, banks will dissappear, Wallet online Blockchain or Coinbase will replace Banks, we can look forward to a world in the use of virtual currency and transaction technology of Blockchain, Banks not suitable for future
I don't think banks will easily be replaced by anything as banking system is with us from centuries and talking about blockchain & coinbase bitcoin wallet there is no doubt they are the top bitcoin web wallet right now but we can't assume them to be alternative for normal banks.
Banks may adopt blockchain technology in future as you can see lots of banks are researching on blockchain technology right now to enable them in their banking system. However bitcoin may not be able to replace banks within next few decades for sure.
The only way banks could get replaced is if the system gets shut down and a new one would come up. But I don't think Bitcoin would replace them, because it's untraceable. Unless a new currency that has already been prepared for this scenario is ready, it cannot happen.