I think it will end with no Iron throne.
A queen of the Iron isles.
A barathoneon, gendry on his lands.
Someone to replace the Dornish.
Tyrion either in Kingslanding or on Caterly Rock.
Sansa as warden of the North.
Royce with cousin Peter back in the Errie.
There are still some Tullys about.
I think overall rule will end, and everyone will be free folk eventually.
Cleganebowl to occur, but I doubt it will be as epic as anyone imagined.
I second the Cleganebowl thoughts, I dont think we will see an epic fight between the two of them, I suspect all that will happen is that the mountain will be giving someone the smackdown, Arya maybe, and the hound will come along and kill the mountain, but in a quick way, like immolating him or pushing him off a cliff or something non-face to face combat style like that. Hound will survive but give up fighting forever.
As for Sansa, she will become Queen of the North, I reckon she will survive and Theon will survive and they will marry.
Sam will become Lord Tarly
Arya will survive but with no war left she will become bored and return to Braavos to the faceless men. Who knows, maybe her final scene will be her disembarking a ship and being greeted by Syrio.
Brienne will live and become the first female commander of the kingsguard or whatever they are called.
Gendry will survive and be legitimised as Gendry Baratheon.
Tyrion will live and win the throne, in lieu of nobody else wanting it and will grant the North independence.
Cersei will die.
Jon will die.
Mormont will die.
Grey Worm will die.
Dany will die.
Jamie will die.
Tormund will die.
Edd will die.
Beric will die.
Davos will die.
Bran will "die".
The night king will "die".
All the dragons will die.
Bronn will survive, and the final scene of the series will be Bronn bidding farewell to King Tyrion, first of his name, before riding off to his new castle and looking back one last time at Kings Landing and saying the final sentence of the show "**** the Game of Thrones".