I think that every year more and more banks will be engaged in the storage of Bitcoin. I think that this will be a big step in the promotion of cryptocurrency. It sounds incredible but it can become a reality.
It can happen if investors and traders will push this, banks are still a business and if trends will force them to adopt then they don't have any chance to deny it, they need to adjust in order to sustain their businesses, so when things are already been adopted and people around the world are willing to use this new form of currency any time soon this features will mostly be added to our bank accounts.