When Guardiola said that he doesn't believe that anyone in the Premier League will be able to repeat City's achievement in the coming seasons, I think that he wasn't bragging, but simply assessing the situation adequately. And in my opinion, it's not that important, I still consider Guardiola one of the best coaches of our time, who knows how to build a team and win tournaments, so I'm sure that if you give him enough time, he will become champions with City again.
I believe Pep Guardiola knows how difficult it was for his team to have gotten the record of winning the league 4 consecutive times that's why he could make such utterance, EPL is one of the most difficult league in the world but Pep Guardiola set the record together with his boys, right now I still don't see any team who can repeat what Manchester City has done that is the more reason Pep Guardiola needs to be given more time to bring back the performance of his team and to lead them to winning more trophies. Manchester City can bounce back next season but they need to change their strategy and bring in more players to challenge for the league next season.
Now in current time it's never been easy for any club to keep things on level and also keep winning because money is having big impact while injuries and many other factors are also having huge impact on clubs performance Pepe Guardiola is creative coach who can bring good changes on important times which can give them good results.
After long time Manchester City faced problems while things were on good winning streak but in this season their players fail to keep quality with consistency and things gone badly down for them now again they are trying to have their rhythm with new players which are had good potential. In this season, now they have settled without any trophy but coming season is going to be again on good level because their strategy is good, and their top players are surely going to fightback for their supremacy in Premier League.