If that were the case why are share prices of the banks so...

If that were the case why are share prices of the banks so depressed and why are the shutting branches I think nearly half their mortgages are from brokers so they are losing profit ,credit cards have formed an important part of their profits and the swing to debit cards and other providers that offer better conditions will continue to hurt them ,the low interest margins will persist for the next few years and that means lower dividends and the much talked about yield trap.
I bought into all the banks in the GFC and was rewarded with growth and good dividends but now NAB,ANZ,WBC are back at GFC prices the CBA has fared a little better so there has been no growth in 10 years and capital raising I bought MQG at $18 in the GFC and have rewarded share holders with reasonable dividends and plenty of growth.I sold out most of the big 4 and got into growth stocks and they have killed the banks and I think the next few years will be the same the game is up for their cosy little deal now they have competition.
If you think the banks are a good investment then I hope you don't have all your eggs in one basket as many self funded retiree's have found out when they believed high bank dividends would go on for ever,dividends are good but when there is no growth they are wealth destroyers.