Banks as in "put your money in a bank to be safe" must go!. There is no point in putting bitcoins in a bank, unless you really want to lose them. Same for transfers between people, there is no longer the need for a bank.
As for the other things that banks are involved in, like lending and investment funds they can go with Bitcoin.
But taking a mortgage in BTC ....not a bright idea right now and for a few years.
Unfortunately, people storing coins in exchanges and online wallets show us a different trend.
conscience?