It would be great if Napoli could show football again what they showed in the first 75% of the competition. but they depend on the players, and if they can keep this team together? I think that will be quite a challenge. Napoli's performance and game image has of course not gone unnoticed in the rest of Europe. I don't see either of them going to another team in Italy, I think you have to think of countries like England where the big money is waiting. Juventus will want revenge for the past 3 mediocre seasons without a single title.
Are you sure if Napoli will be able to maintain their slick performance for next season. Several problems have occurred recently where Spalletti has decided to leave Napoli and that is a setback that will hamper their performance next season. It's been a week since Spalletti has leave from Napoli and there has been no sign of who the Napoli management will show for their new coach.
Several Napoli players have also been targeted by big teams and it depends on their loyalty. if they choose a large salary it is very likely that if 1 or 2 of Napoli core players leave for another team in this transfer window. I don't think Napoli will be able to show anything as extraordinary next season as they have shown this season.