Serie A is so dead on market, maybe only Napoli will be able to spend some money if they will sell few players.
Otherwise we will have basically only on loan players.
I don't know why something like this can happen to Serie A.
Napoli always try to be the best team in Serie A so they are willing to sell several players so they can buy other players who have more potential to give their team a lot of strength.
Considering that they have only won the Serie A title 3 times so with better player transfers it will provide better strength and the possibility of getting the opportunity to become champions again next season.
Hopefully they can do some better player transfers in preparation for next season.
After all, they will also be playing in the Champions League next season, so the replacement of several players is urgently needed.
This is the reason why many players and even coaches will want to go to English Premier League for their career. The English Premier League teams have good money. Even if you do not make it to top4, you did not even make top 10, in as much as you are playing in the English Premier League and not relegated you are entitled to a huge sum amount of money. This makes it possible for even small clubs in England to compete for players with big clubs.
If Napoli sells much number of their good players and does not reinforce, it will definitely affect them