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.
Never say never when it comes to football. If Napoli were able to win the league trophy last season tell me why it is impossible to win it this coming season with the recruitments they have made to further improve their team. I think it is very possible, their team looks very organized and stronger for next season.
Of course, they could win the championship next year too. I think they finished tenth the year before. But they won the championship last year. This is a testament to success. If a team that finished tenth the previous year wins the championship the next year, it's thanks to transfers and good management. Napoli is one of the biggest contenders for the title next year. They've made transfers, and these players are qualified to contribute to the team. They've become one of the strongest teams in Italy. Napoli is one of the natural favorites for next year.