Have also seen some different places that will take bets on who rules the throne at the end of the season
- Daenerys Targaryen (2:1)
- Jon Snow (2:1)
- Bran Stark (3.5:1)
- The Night King (10:1)
- Tyrion Lannister (12.5:1)
- Cersei Lannister (15:1)
- Jaime Lannister (15:1)
- Sansa Stark (25:1)
- Arya Stark (40:1)
- Euron Greyjoy (50:1)
- Varys (75:1)
- Gendry (75:1)
- Samwell Tarly (75:1)
For my money, I'd take The Night King at 10:1 and maybe even throw out a flier on on Gendry.
To answer your question, I think it has to be Jon. The story is about him (and his dad) for the most part. Jon or the Night King but I don't think he'll take over in the end.
My guess is Jon will be named to the Iron Throne once everyone knows he is the rightful heir. Each of the seven kingdoms (or nine provinces + the Wall) will then become their own territories and have their own ruler but will be unified on the same "team" with Jon as the de facto "leader" but he'll be hands off unless necessary.
Obviously if they die they're out but this is my guess:
Crownlands: Jon and Dany
Iron Islands: Yara or Theon Greyjoy
North: Bran
Reach: Samwell and Gilly
Riverlands: Jaime and Brienne
Stormlands: Gendry and Arya
Vale: Sansa and Robin
Westerlands: Tyrion
Dorne: Ellaria if she lives otherwise Varys or Davos?
The Wall: Tormund
Jon kills Night King. Theon kills Euron. Jaime or Tyrion kill Cersei. A lot of lives lost along the way such as the Mountain (to the Hound in CLEGANE BOWL), Beric (to save Jon), maybe Greyworm (to save Dany/Missandei), maybe Melisandre (Jon or Davos for murdering Shireen), maybe Jorah (to save Dany), Podrick (to save Brienne), Qyburn (evil).