How Game Of Thrones Will End (loosely)

i have a theory that when cersei has lost the war she'll blow up the entirety of kings landing like the mad king planned to. taking a quite a few of the main cast with her. itd make the series come full circle and itd be a testament to how crazy she is. but then tyrian is left to pick up the pieces and establishs a democracy and the age of kings comes to an end!