The three star players you mentioned are of course players who have contributed greatly to Manchester City ability to win various trophies, but I think losing these three players will certainly not necessarily make Manchester City weak and out of the title competition next season, Guardiola built Manchester City with a collective principle and relied more on teamwork than an individual player,  So I think every player who leaves later will not have too big an effect on the team performance, including the loss of Kevin de Bruyne, Bernardo Silva and also Ederson.

The coming and going of players in a team is of course a common thing, including if Manchester City loses the three players, of course with the finances they have, it will be easy for Manchester City to get another player who can indeed replace the position left behind, of the three players, maybe only Kevin de Bruyne will be difficult for them to get a replacement later although indeed currently there are many young and great midfielders but I think it will be It's hard to get a midfielder as smart and complete like Kevin De Bruyne.