Well, if the movie as good as Batman:The Dark knight,then probably,but DC's character is not so popular here,most non-comic fans can't name one single DC character( Superman and Batman are two exceptions ,but most people don't know they're from DC),other than batman and superman,other DC hero have no fanbase,so the thing are all depends on WOM,5 years ago Aquaman is the surprise but I don't know if Flash can copy that situation.