This is why powerscaling is dumb. Even if they are powerful, its not about them being stronger or weaker than any remaining Yonko or Admirals. Thats not really how the series operates.
The WSC is now irrelevant to the rest of the story (for now), implying that the remaining Yonko and Admirals are, relatively, more important/dangerous to Luffy and crew.
For the Gorosei to the "the strongest" or "most dangerous", they'd have to be the last major villains in the series. While this is certainly possible, its not even guaranteed with BB and Shanks still in the running. Its also a pretty big detriment on the Admirals specifically because its currently assumed the crew would need to go through New Marineford before Mariejois. I.e. Admirals first, then WG/Gorosei
So yes, maybe 1 or both Yonko fall before this. Itd cement the level of danger any pirate would have against the Marines/WG, but we dont even know this yet. Its also just as likely the reverse happens. Maybe the final war is somehow before Laugh Tale. Maybe Mariejois isnt the last location. We actually dont know the order yet.