I actually think DC would do well to knock out some villain movies. Not a ton, but a few here and there?
Aside from the obvious exceptions, DC's rogues tend to be far better than Marvel's and could provide the kind of novelty audiences are looking for. I mean, who wouldn't want to see a heist film with the Central City Rogues? Or a corporate espionage film with Lex Luthor? A movie about Ra's al Ghul trying to 'save' the planet could be a really compelling mix of climate warning, terrorist movie, and Kurosawa, depending on how you spin the League of Assassins.
Again, not something I'd want a lot of, but a few sprinkled here and there could help keep things from getting stale. And I think that's the only problem the genre currently has. Marvel's used the same formula for fifteen years and other studios haven't been successful enough to matter (and often just try to copy the MCU anyway). It's not superheroes people are bored with, it's getting the same kind of story over and over again. A quality bad guy movie, in the flavor of Guy Ritchie or Tarantino? That could work.