Napoli is certainly doing well for this start of the season. I must say that they are currently enjoying first place in the tournament, but we'll have to see if they can keep up this pace.
It is important for a team to know when it is time to stop and take a breather, if they don't do so they risk not being able to cope with all the commitments.
Napoli are currently maintaining their consistency and are undefeated in their last four matches. I think as long as they continue to perform like that, they can defend their Serie A title. However, we shouldn't get too complacent, as Juventus is only 2 point behind Napoli and could reclaim first place if Napoli drops points.
The season is still long, and we can't accurately predict Napoli future, as they also have a crucial Champions League competition to contend with.