If both of them also leaves Manchester City would definitely have serious issues. Rodri is a player who is rare of his kind. His skillsets and strength are making huge difference for his team.
Haaland is a big goal source at the same time. He just needs to improve his performance in big games and that's all. He is already a really deadly goalscorer. The team is like complete with him.
Look at his stats in the 23/24 season, it's insanely good.
https://www.transfermarkt.com/erling-haaland/leistungsdaten/spieler/418560/plus/0?saison=2023
For me , KDB is one of the greatest midfielders in football history no matter what he chose to do next.
De Bruyne has absolutely done everything he could in Europe so far. It is hard to describe how big contribution he has made. He has achieved a Champions League title with Manchester City as well.
I think all he has done is enough for him to just look for some changes as of his turning 33 years old at the same time. He can make lots of money by accepting a potential deal from Saudi Arabia for example.