I don't see complications in the Premier League but a change of era. It will be terrible for Premier League for them to allow Manchester City to win the Premier League for the 5th time. That will clearly send a message that Premier League belongs to Manchester City and it will turn to a farmers league that they used to mock Laliga back then, it will just looks like the table has turn around. If Arsenal is even the one on the top of the table, I will make me happier than any other fans.
Chelsea deserve any recognition and PR they are having right now. It's been a long time since those guys taste that top 4 and they can finally has the opportunity to go for Champions League. If Chelsea doesn't over take over Manchester City right now they have he opportunity with good performance, it might be difficult to do later because the way Manchester City camp is silent, they must be really preparing for surprise any time soon.
4 consecutive times is a clear signal that Manchester City owns the Premier League title. Nothing is needed to prove that. Winning for the 5th time would only mean that other Premier League teams are incapable of doing anything about it and they are weak. INcluding the other teams that have put in efforts to take the league from City. Teams like Liverpool and Arsenal are in the best position to stop the era of Manchester City, they fail every season due to one or two minor mistakes along the line.
Also, for Chelsea, they have improved and with the look of things, they can possibly qualify to the UCL next season if they maintain consistency. But let us not forget how difficult the league can be during the first quarter of next year. And this year, I don't refer to any team as a small team. The League is getting tougher and every team has stepped up their game.