At this point, I think people are just waiting for City to lose their dominance themselves. Look at Bayern, Leverkusen had amazing results, but Bayern sucked all season long too, lost to Leverkusen terribly. I think it is clear that some team will do great one day, but also clear that we need to see City start doing not so great eventually. For the time being, it is a "failed season" for them when they win the premier league and nothing else. Which goes to show you that they are way better than anyone else.
Winning premier league would be the biggest achievement any other team could dream of, it is not even an achievement for them, hell fans did not go out to celebrate that much, it was just a few thousand people. Imagine being bored of winning premier league.
Every good thing had to go one day with it's all by nature same happen to Bayern Munich with they were dominating club in Bundesliga for the last decade but suddenly things gone against them, and even they were having all weapons but fail to achieve their best which is not surprising same thing waiting for the Citizens with currently they are dominating in Premier League and things are going as they wanted which is surely amazing but one day they also have to lose this all with this can happen in next season or after this season as well because many players and coach is also near to his contract end which could be big turning point for them.
Even they are doing their best for having all things well-prepared for this all but no one can stop the changes which are always happening around us now we are having few clubs which are doing their best and having good chance of overtaking them.