Coal. Despite any great speeches you've heard, it's done. Everyone knows it. China is buying less as is the world. The days of coal are over. Natural gas and more renewable clean energies are the future.
Classical music. Is it done? There are some who say it's over and there are some who say it's just beginning. They claim it's going to make a comeback: it's just getting (re)started.
Church - maybe even religion. Is it coal or classical music?