Well, correct me if I am wrong but the reason SR had such a massive budget was because WB was tacking on all the costs of the failed attempts to get the Superman franchise back on it's feet for 19 years. If SR had cost say what BB or IM1 cost, then it would have been considered a success with it's $390M WW gross(BB only had $371M). If it's done nothing else, SR has taken care of all that old debt so that Snyder's Superman shouldn't get any extra amount tacked on that would make profitability more difficult. So I see this film costing in the 150-175M or so range rather than the 250M SR got stuck with. So at a budget or 150-175M, even it it just made 400M and got into the X-men range it would still be successful enough to warrant a sequel which might do even better business.