The number of people is getting smaller and smaller. I know many of who are alive will not be a candidate for the iron throne but not having Jamie there is a bit weird, I know he won't sit on the iron throne most probably but he is at least much better candidate than Cersei at this point, Cersei is literally the one everyone needs to beat now and considering she is the bad guy on this season after Long Night is over I can't see how she could be really in for a candidate over Jamie because if everyone dies fighting each other at least Jamie could still claim the throne somehow, I once again repeat I don't think he will sit on the throne but he should have higher odds than the current occupant, otherwise we can assume Cersei just beats everyone and keeps the throne which wouldn't be a good ending at all.