Banking a kind of need? Functionally yes, but why with an existing organisation? Read the other article about mobile phone payments, and ask yourself how long it'll be before an obvious next step takes place. I'm thinking of Vodafone et al becoming retail banks, as Tesco already has.
Now our deposits are guaranteed by the government rather than a bank's reputation, and now banks' reputations are mud rather than gold, it makes a lot of sense for large retailing organisations to cut out the middle-men and raise (some of) their working capital by becoming retail banks.
Agreed, HSBC are god in a mostly bad bunch ... and at present I bank with them. Not keen to buy the equity, though.