I just realized the Night King isn't on the betting list.
If Dany's vision comes true, everyone who ever placed a bet on GoT is going to lose.
Night king is listed as a 9.00.
Who will rule Westoros at the end of the series?
Daenerys Targaryen 4.00
Jon Snow 5.00
Cersei Lannister 5.00
Sansa Stark 9.00
Tyrion Lannister 9.00
The Night King 9.00
Euron Greyjoy 11.00
Petyr Baelish 13.00
Arya Stark 15.00
Bran Stark 17.00
Jaime Lannister 26.00
Samwell Tarly 34.00
Varys 41.00
Ellaria Sand 67.00
Jaqen H'ghar 67.00
Brienne Tarth 67.00
Melisandre 67.00
Yara Greyjoy 101.00
Theon Greyjoy 101.00
Gilly 251.00
King's Landing could be burned & abandoned(as in Daenery's vision). It could imply people decided to live in other places which have a better climate. If there was enough real estate damage inflicted on King's Landing it might be cheaper to abandon it, rather than repair it. Haha. I'm kidding.
George R.R. Martin seems to enjoy killing off main characters & showing that no one is immune. Maybe his end game is for everyone to die, as you say. Cersei couldn't work together, cooperate or prioritize the survival of the human race above her own greed. Maybe none of them will survive that.
On the other hand, not all visions and prophecies in game of thrones come true. Daenerys child was prophesized to conquer the world. That vision/prophecy never came true. There's a chance Daenerys vision will not happen.