what about the no one option?
the white walkers may kick everyone's ass and there would be no one alive to be king, or another power may emerge
~snip~
no-one option is:
The Night King 7.00
Here is my theory - humans will fight against each other, they will be weak, winter will come and Night King will defeat them all. He is un-dead king with special abilities ffs! Who can compete with that?

And it is the end I would like to see
