Banks will change or go under but they won't go away. They will always find some service, or product to provide that someone else will want to buy.
thats right mate whatever happen banks will find its way to still exist.
Anyway we still need bank to saving our worth property, although the most of people use bitcoin and bitcoin will be the one of currency that used in the world. Bank is realy great corporation that supported by goverment, bank will not easily gone becouse goverment will always help the bank. If bank suddenly gone, the country will realy big problem with their national economy.