The loss of several key players and maybe also their coach next season, then on paper Napoli's performance will certainly change. But yes, I think if Napoli's management can still manage the team well, then maybe Napoli will still be able to compete well in the top four next season. Because after all, losing key players and coaches also does not guarantee a team will collapse quickly, because of course the players also have a better mentality after winning the Scudetto this season.
Players come and go. Just as Osimhen has made history in Napoli so will other players too. Unconfirmed Rumor has it that Napoli is looking to sign in Japanese talent Tachifusa Kubo for the upcoming season.
Real Madrid also has their eyes on him too.
If he moves to Napoli, he is most likely going to play the position of Hirving Lozano. If he moves to Real Madrid, he is most likely be a replacement for Marco Asensio. I think he would be a perfect match and would fit into the team easily. Kubo he is also a good goal scorer.