Man City will still be one of the strongest clubs in England and Europe..... Even if there will be no Gundogan they have great players.... I understand if De Bruyne or Haaland had left, then we could talk about some problems.... But now I don't see any problems for Man City...
For the next two or three seasons I agree with your opinion, Man City can still be a strong team in the English Premier League and European Champions League. They still have key players who play an important role in maintaining squad depth. John Stones and Kyle Walker are the key players at the back, the midfield is Kevin de Bruyne and Jack Grealish plus Bernarno Silva the vital role that is assigned to them is answered well in every game, in the striker positions Erling Haaland and Riyad Mahrez are still Pep's top choice Guardiola.
If Guardiola loses the names I mentioned earlier in the transfer market then we will see Man City will definitely be busy in the transfer market. Now do we see Pep looking for a player? he looks relaxed despite several players being linked with Man City. Losing players like Gundogan is not a big problem for Pep as long as Bernardo Silva is still alive.
Well about three seasons, I wouldn't be so sure Man City can play at that pace regularly... Remember Chelsea when they won the Champions League final against Man City, but the following seasons ended in the middle of the standings due to changes in management... But about the next good season for Man City I have no doubt...