Yes, that is good idea. when we have disciplinary bitcoin bank, we feel safer while trading or purchasing and we can deposit or withdraw bitcoin as like as FIAT. Now bitcoin is not yet recognised as legal currency for all countries in the world. I expect we will have a true and legal bitcoin banks for bitcoiners.
For now we can use our wallets in order to keep our bitcoins , There are some bitcoin ATM in our place that i can use in order for me to withdraw and to buy bitcoins but i can store bitcoins there. If bitcoin sill be legal in every countries in the world were bitcoin life will surely be more easier.