Arsenal has a good squad also but the squad doesn’t know how to get a well work done when it comes to winning the league, Arsenal has been making the same mistakes for more than 2 years now by allowing a small team to defeat them and give Manchester City a chance of winning the league, I don’t expect arsenal to win premier league title next season, they can win another trophy but you see the champion league and premier league title arsenal cannot win it with that squad they have currently.
It is unfair to guarantee Manchester City the Premier League even before the season kicks off. This is purely your imagination and nothing else because I can't call this prediction. If I were to say the season has started, I would have said it is a prediction, but the season has not started. Moreover, in the season that just finished, many people were thinking Arsenal would get the title even though later they failed to make it, but they were at the top of the table till the last day of the final. Remember that nothing is impossible in football.
A team that you underestimate may take the trophy you did not expect, so I don't know how much you underestimate Arsenal's reach that makes you think they won't win the trophy next season. Just know that Manchester City can also fail to another team.