It must be time for Napoli to stand up again. Their next game is going to be against Verona away. Verona are in a really bad condition now. Despite the drop in Napoli's performance recently they are still a way stronger team here. This game should be a good opportunity for Napoli to make up for that Fiorentina loss as well.
Besides winning this game is important for Napoli to improve their morale before facing Milan home next time. Because that game is going to be hell of a challenging one.

Milan are at the top of the standings you know. Just as Fiorentina did Milan can also beat Napoli away if Napoli don't make progress.
There is a possibility that Napoli will rise as soon as possible but not to become the leader in Serie A because I seem to be starting to realize that Napoli only got the title last season because it was managed by Luciano Spalletti but after he leaves Napoli everything will change and the title holders in Serie A will only be there are Inter, Milan and Juventus but the power of my mind goes to the Juventus club which will win the Serie A title this season.
Against Verona and away from home it is quite easy for Napoli to beat Verona but if a surprise happens I would not think that Napoli are bad but just that their glory is over.
But still Napoli is still the bookies' favorite and I will guess the final score 1-4 for Napoli.