I see impossible to see Napoli being champion of the SerieA back to back, they never do something like that plus Inter needs to win something asap after losing it all in the end of the last season.
This plus this Napoli seems to be the best one and when this kind of teams are in that particular position they start to fall.
Napoli may set the record next season and win the league back to back because the only team that is strong enough to challenge them is not very feet at the moment and Conte is doing his work to make sure they remain the favourite in the title race with the players they have in the team already. Inter Milan's previous losses last season will still hunt them until they have changed their performance and game play completely if they still begin the new season with the same formation and energy they will find it difficult to challenge Napoli next season. Same thing goes to PSG in French Ligue1 they should be careful if not they will have a strong opposition after Chelsea exposed their weakness.