Don't be ridiculous. Bitcoin is little else than a reliable and decentralized transaction network, and a currency. Banks are connections between customers that

Don't be ridiculous. Bitcoin is little else than a reliable and decentralized transaction network, and a currency. Banks are connections between customers that have deficits and customers that have surpluses, ie: credit and lending. There are also investment structures that people use, ie: stocks and bonds. In addition to consumer banking and investment banking, there is also insurance functions. There are companies that meet individual needs (ie: companies that do only insurance) but many consumers still prefer to utilize "one-stop shop" banking institutions that accommodate a variety of needs.