Since they are in a team that won the UCL this year, their departure to another team would only be valid for players who have less playing time at PSG. Otherwise, it would not make sense for a player who is in the main squad of Paris Saint-Germain and plays constantly to go to another team. Because Paris Saint-Germain is now a team that is the Champions League champion. They have achieved the medal that every footballer dreams of and they will fight for it next year.
PSG is in perfect shape, they won the trebble including the UEFA Champions League, it shows how strong they're so I don't believe that Enrique would disorganize the team by selling his key players, he might sell or loan out some academy or bench players but his first 11 stays. I believe their would be few additions cause even the strongest teams still need to strengthen all areas of their squad against the upcoming season, it's even the right team to do cause a team that's to defend the Champions League next season needs to be fully ready, if you notice, Real Madrid and other top teams that didn't really perform well in that tournament are really getting prepared in the transfer market, PSG is watching them so I believe they too would recruit some few additional players to strengthen their depth.
Guys, I completely agree with you that players who have won titles with PSG will definitely consider again to move to another team. And Enrique will certainly also consider other things besides having to sell his best players last season. But something can happen because it's not Enrique who is in full control at PSG but the PSG president can also determine whether some players stay or are sold. But looking at last season's achievements, I think Enrique and the PSG president will not make a careless decision.