the 'it just works' was a nerd joke (Bethesda game studios reference) The technology works, and marty has been able to settle his electrician's invoice with sats and not some fiat paper money. So it is still p2p digital cash, nothing changed there. The world we inhabit currently is still competition driven and dangerous because of human greed. I do not agree with it, but that is the situation and as such the risk of a physical attack is always there. This is a social problem, not a technological one. Fix the money, fix the world. Not the other way round.