Orihime's power is to reject some event that occured in the past..
So.. yea, I belive she might die soon, Aizen might just go and blow up the city, then force her to reject the blowing up of the city, and of course she will die.
In the end Aizen will have the key + as nothing happened.
She essencialy didn't "ressurect them" but instead ignored the fact they died.
You can not rez, something that isn't dead to begin with.
Might be there a limit on her power thou, like some sort of fragment of the person you want to do her thingy, like Tsubaki. She had tiny pieces of him.
"Chile is a thin and tall country"