Look at it this way the first film made them 15% the last film lost them 15% collectively even if you take into account the increase in budget for XII they only made a collective 5.8% loss which isn't too bad once you do factor in merchandising,DVD and blu ray in but I'm just saying those things alone won't carry the franchise for ever.
If your competing with Marvel movies on budget you need to start getting similar numbers at the box office, the closest one to Into Darkness's production budget was Iron Man, saying it was the first MCU entry so was starting from scratch and it was one of the more modest successes (15.49%), it made $90M more on its US gross and $25M more Internationally for $115M more that Into Darkness in total, saying that it was made for $4M less massively shows how much XII under performed
If your competing with Marvel movies on budget you need to start getting similar numbers at the box office, the closest one to Into Darkness's production budget was Iron Man, saying it was the first MCU entry so was starting from scratch and it was one of the more modest successes (15.49%), it made $90M more on its US gross and $25M more Internationally for $115M more that Into Darkness in total, saying that it was made for $4M less massively shows how much XII under performed