I'd just say that's not what it's for. There are drawbacks to every payment medium and that's why there are various payment mediums. Can't sit a computer and send cash to an online store, so we have CC/debit. The gas station doesn't accept gold, so you can pay in cash. Some people don't like accepting large amounts of cash, so you can give them a check/mo. I'm also fairly skeptical of bitcoin, but there is no payment medium that ticks every box.
