Cersei's queenship: A younger, more beautiful queen will be Cersei's undoing.
" Cersei: When will I wed the prince?
Maggy: Never. You will wed the king.
Cersei: I will be queen, though?
Maggy: Aye. Queen you shall be... until there comes another, younger and more beautiful, to cast you down and take all that you hold dear.[1] "
Cersei's children: Cersei will outlast her children and die by the hands of the valonqar.
" Cersei: Will the king and I have children?
Maggy: Oh, aye. Six-and-ten for him, and three for you. Gold shall be their crowns and gold their shrouds, she said. And when your tears have drowned you, the valonqar shall wrap his hands about your pale white throat and choke the life from you.