Well, it would not surprise for for Jon and Dany to die ending the whitewalker threat and for Sansa and Tyrion, who are actually still married; to re-unite and jointly rule the Seven Kingdoms.
That’s possible, but there’s that whole bloodline of the King thing, too. King Baratheon, and Cersei, thought there were no Baratheon heirs. But Gendry is a Baratheon heir. What claim would a Stark-Gendry (nee Baratheon) bastard have as an heir? Thin, but maybe not zero.
Dynastic politics is like blue-blood reparations. Everybody’s got some claim on the prize.
Incest: It Runs In The Family.