I think the prophecy was in the first episode of season 5 (or 4). It's been a couple of seasons since Joffray died somaybe Tommen in this season and then her daughter in a couple more seasons? Plus Tommen mentioned starving himself in episode 7 of this season. And with Cersei's uncle due back who knows what would happen? If Tommen does die then will the crown go to his sister, currently in Dorne? I think Tyrion has something in mind for Jorah... not sure what? Victory in the fighting pit. If course, Jorah has the added complication of turning to stone maybe!