They needed a sacrifice to show how God Doom was powerful which is a shame. Although I still hope Phoenix has a role to play in SW after all it is a symbol of rebirth.
Please do not remind me Bendis because prefer forget the mess with time travel and the revolution that never happened that would change the status quo of x-mens in the last 10 years but believe marvel think is more fun decimate mutants again .
Have nothing against Cyclops disappeared for a while love the character but he became a figure so powerful that almost everything that was happening had something to do with him. In a way the world of the X-men's currently still revolves around him and supposedly did. Their disappearance is good for balance and make room for other characters.
Because the Cold War between Marvel and Fox as well the rise of the Inhumans we can not discard the hypothesis it is another attempt to discredit the character before fans and make him a villain again. I would like to believe Marvel has good plans for him and his return will be triumphant to save the X-mens and mutant race again but everything indicates the opposite direction so far .