I don't think there was much chance of them ever making Agatha a god-queen, but now that Ascension has been painted as something deeply achievable (as opposed to a Legendary Lost Thing That nobody Can Do Anymore), and we've seen what it takes (A female spark and access to a Flame), God-Queens run the risk of taking over the story, and we'd be forever dancing around "Why doesn't Agatha just become a God Queen since she's close enough that Lucrezia in her body was able to almost get there at will, and also Ascension would solve so many problems".