i think no people lost his money in bank, it's just lower interest if we compared with bitcoin interest (rising price).
but i think not all people who stored his money at bitcoin get interest, growing his money, some people who buying bitcoin in $700 and hold it, now lose arround 20% of his money.
bitcoin price dropped little bit but it will raise again and everyone who invested when the price was 700$ they will also get profit. this is the game of patience. anyone one who have strongest well power well be in more benefit..
and banks won't give this amazing feature, but there is no chance that bitcoin can disappear banks. banks will remain.
Yeah bank is going to remain because the people really needs bank for the security of their money. And mostly, people who have millions of bucks are going to lend their money to the bank for the bank is able to use that money for investment and the bank is going to do the bank so that your money is going to grow easily.