Agreed, I don't get the argument that Superman Vs Batman movie is getting green-light because WB are disappointed with Box Office results of MOS. It has nothing to do with what MOS earned at Box Office. They are making SVsB movie because they want a Justice League movie in future which cannot happen without Batman. Since it is too soon to reboot Batman, this is the way to introduce a new Batman in the shared universe. It is clear that they are setting up a shared continuity.