I'm definitely too old to keep track. They are rebooting the DC movies, again, under James Gunn (who did the second, better, (The?) Suicide Squad and Guardians of the Galaxy) which I thought meant all the existing Supermans, Batmans, Wonder Womans and Flashes are all gone. But they are still doing a sequel to the Joachim Phoenix Joker and maybe Pattinson gets another go at Batmanning?
Marvel worked for a long time but I think the idea of everything being connected should be over - just make films of them doing their own things. Superman doesn't really need any friends to help him out, he's ridiculously overpowered as it is, so by the time you've found a way to weaken him, you then have to also find a reason why his mates can't just fire the krytonite into space.