Thanks to Pep Guardiola, Manchester City can get a strong performance foundation so that they become a team that is really difficult to beat. Pep Guardiola's success has made Manchester City lucky because they have found a coach who is suitable for them so they can win consecutive titles and of course that is a very good achievement. I don't think Manchester City will experience a decline in performance if Pep Guardiola is still with him, of course with Pep Guardiola's guidance.
Pep Guardiola has made a big contribution to Manchester City, because Manchester City, which is coached by Pep Guardiola, has made them lucky because the guidance and direction he gave them succeeded in making Manchester City a strong team. But you need to remember, no coach will stay forever, so when Manchester City is left by him, I don't know if Manchester City will find a suitable coach again so that they can still remain consistent or they will experience a decline in performance.
Pep Guardiola is smart manager and difference with the other although some manager supported with much money but get failure when signing players have most expensive market values.
Pep Guardiola success build strong foundation for Manchester City by signing top talent players and not difference significant of their qualities between regular and substitutes players.
Last two season, Pep Guardiola losing his key player Ikay Gundogan after joining with Barcelona but he has another players could replace well on holding midfielder and make Manchester City keep dominance for winning Premier League trophies. I think next season Manchester City keep the favorite team become the winner regarding how consistency performance until the last game weeks.