Quote Originally Posted by Uncle Ruckus View Post
Before the Lannisters can go to war Tommen is going to die somehow. When he dies Cersei is going to burn down Kings Landing. I think when she asked Qyburn about those rumors that it was about all the wildfire the Mad King hid underneath Kings Landing. Tommen dies, Cersei burns everything to the ground.
I think you are right. I read somewhere that you one of Bran's visions was the Sept burning so that makes sense. If Tommen dies then who is king? I think the High Sparrow is worried that Tommen will die without a heir so he would lose his influence hence him telling Margery to get busy.