This is my opinion.Banks won't make you rich.saving in bank can never do that,because of interest rate that bank gives you is too tiny.You saving will be simply be eaten up by the sleepy monster called inflation. As a example I will take ,When I'm in grade school,each day I received 10Rs (my country currency) from my mother.It was enough to by me 2 meals,but in now 10Rs enough to buy 2 candies. 
Banks are just for keep your money safe! 
Banks are just for keep your money safe! Yes,if you invest your money in bank it won't make you rich so better invest your money in bitcoin because there's a great chance that you become rich in here.
I agree, bitcoin will make you rich if you will invest the money instead of putting it in a bank, but its not like that, you need to wait and have patience because the price is not stable, and your investment would take time to increase. But remember dont invest all your money, better save your other money in bank so that its safe and if you have emergency you can take the money and use it, because if you will put all your money in bitcoin you cant use it for emergency purposes because you will just lose your money if you sell it in low price.