Yeah, on one hand I agree, but... it was no longer the game of thrones, it was just Starks + Dany versus the Lannisters. There were no longer alliances, secondary characters that could even mentioned, just the very top players and no one else. As soon as the figurehead of an house died, it's like his entire kingdom ceased to exist with no pretenders, no new lieges or lords appointed, nothing like that.
Cersei was "losing enemies by the hour" - the examples presented were Yara, already sworn to Dany, and "the new prince of Dorne", an unnamed character that didn't speak in the finale. Dany 20 seconds later replies that her "enemies" grow stronger - which are your enemies, plural? it's just Cersei sitting on the throne.
There's nothing between Winterfell and King's Landing, not even the Twins where, you know, Edmure is kept in a cell even after the entire massacre of the Freys. What happens once the Tyrells are gone? who knows. What happened to the seat of House Baratheon? who knows. How is the population of King's Landing reacting to Cersei? are they actively oppressed as in curfew, insane taxes, nazi-like surveillance in the streets? who knows. What do they think of the bombing of the Vatican with the Pope and the beloved Queen inside? are they going along with the excuse that it was a tragic accident, as Cersei told Mycroft Holmes from the Iron Bank? do they hate Cersei but are powerless to revolt? who knows.
There's nothing else except the Starks and Dany (plus whatever the plot decides her remaining army is) and Cersei with Qyburn at his side in King's Landing.