A good question is: Why would a bank want to give the option to their customers to hold bitcoin themselves? Isn't it against the whole point of a bank? I mean it's fine if they announce that they keep reserves in bitcoin, but why promoting it as a currency if it makes your business poorer?
Hundreds of years ago banks were dealing with gold and other precious metal money, there's nothing that says that banks can't deal with Bitcoin. Bitcoin can't replace all financial services, it can only offer transferring and storing of money.
I understand that not everyone wants to be completely responsible for their money, and therefore banks or some sort of third party is likely forever going to be needed. Although, I think by default at the very least the client should be offered what they want to do by default, and be explained without bias on what that exactly means.
You don't have to store all coins yourself or put all coins in bank, you might want to put some portion of your Bitcoin stash into bank and maybe earn interest on it or have it there in case something happens to your primary storage, or for easier inheritance and so on.