We keep seeing trends on this list. After nearing all fifty, the trends become more apparent. Animated movies. War movies. Historical movies. None of those have a great track record. King Arthur falls into the historical movie category. It's a huge investment to make one of these. When you factor in location, costume, and the fact that no one cares about the history of King Arthur.
You can't have kings and knights without spending a pretty penny. The movie cost one hundred and seventy five million dollars. It definitely looks that expensive, but people don't come to the theater just to see how expensive something looks. It only brought in thirty two million dollars. Just between you and me, I'm OK with there never being another King Arthur movie. Don't reboot it, remake it, or reanimate it.