Considering that Guardians of the Galaxy was basically Marvel's way of saying "Even though we don't have the licenses for our most popular characters, we can take a group of heroes that most people don't even know or care about and release a film that will make you like them because dammit, we're Marvel Studios and we're just that good", people who want a WW movie should just petition Marvel Studios to release a Lady Sif solo film so that DC knows it's possible to do it without a lot of hand-wringing about how people won't accept a mythological female warrior as a lead character.