they're 'dead' in the sense that they have a lifecycle that is predictable and eventually peters out into meaningless consumerism; they still arise but they are

they're 'dead' in the sense that they have a lifecycle that is predictable and eventually peters out into meaningless consumerism; they still arise but they aren't seen as a potentially liberating or revolutionary social mode in the way that they might have been in eg the 80s, because we see them follow the same course every time.