I don't think Mikel Arteta is far behind Pep Guardiola. If Mikel Arteta comes here, he can bring in quality players. Next season they will definitely not make the same mistakes as the previous two seasons. The question raised after Man City's fourth consecutive championship is whether the Premier League will become a boring tournament like Bundesliga or Ligue 1? Of course there has to be a team that takes down Man City, And good news for other clubs. Coach Pep Guardiola's contract will expire this season, he can leave Man City.
I believe that because of this, if some other time, they hire a new player to replace an old one, they may make a mistake, then will try to make another transfer to fix that, and could make another mistake, that two mistakes in a row would mean a lot of money gone, and that would suddenly make them not be able to replace some other position and suddenly it all goes down like dominos. This is why I highly suggest everyone to not expect them to be great forever, just a few mistakes could ruin them.
Also, Pep may not want to stay there all the time, sure they are good and all, but what can he gain from staying, he won everything he can, maybe one day he will leave, and when he leaves things could change a lot as well. I believe that we are going to end up with something very different, eventually City will stop being as good as they are right now, it's only matter of time.