Pretty sure Dorne/Martells + Tyrells are joining Deny in the war against the Lannisters.
Now there's pretty much just 4 sides left:
1) North under Jon Snow
2) Lannisters + Freys
3) Euron Greyjoy
4) everyone else (Tyrion, Varys, Dothraki, Unsullied, 2nd Sons, Tyrells, Yara/Theon, Dorne/Martells) under Deny
What I predict it's going to happen: Deny arrives to Westeros in S7. By then, King's Landing is in chaos, Deny's forces enter the city where Cersei has gone full Mad King and is threatening to set the city on fire. Jaime has to kill her. There's a reunion between Tyrion and Jaime, Jaime is pardoned by Deny for saving Tyrion earlier and killing Cersei but has to join the Night's Watch. Just not sure when Euron Greyjoy will arrive, but pretty sure he'll lose too.
Who are you rooting for?