How does the expiry of a release clause, albeit a very high one, reduce his fee?
If he's sold, it will be because Napoli realise their playing asset's reputation is being diminished through his performances for the national team, and they have identified a replacement
If City really want Cavani best to sit tight for the moment. Move now, and Real Madrid and CFC may follow. If they go elsewhere,we can move when there are no other bidders and get him for a cheaper price, if Napoli wish to sell.
I think Cavani's staying at Napoli