One of reason use bitcoin is to prevent bank and fiat, so i think bank adopt/use bitcoin is dumb idea and bank is the opposite of bitcoin.
So, i think it would be bad thing if bank were to use/adopt bitcoin unless they just act as gateway to accept bitcoin or make buy/sell bitcoin become easy.
yeah, i use bitcoins in order to avoid the banks and their huge fees, i just dont like it to be honest and i think it would be great if it was replaced