Prior to the depression banks were allowed to invest in the stock market. A law was passed after the bank crash to end this practice and force banks and investment institutions to be different entities. Recently that law expired and has not been renewed. Well for certain we will see a wave of mergers. We may also see banks stepping into rather dangerous territory of investing and being connected to the stock market.
Banks charge fees.
It used to be the case that checking and savings accounts were free. Today banks have fees for minimum deposit, per check fees and ATM fees. When ATM's were first introduced they were supposed to replace bank branches, save banks operating expense and that savings would be passed on to consumers. This has not happened. In some cases you get hit with a double whammy.