Interestingly, the original bitcoin white-paper had a motivating example that basically amounted to side-stepping banks, because banks do not provide fully non-reversible transactions. In essence, bitcoin was a technological solution to a problem which would have been solved more elegantly by changing financial laws, and requiring banks to offer non-reversible transactions. (the problem with that is obviously that it could be used for fraud, but then you get into the whole debate about freedom vs protection)