I doubt the Vlahovic to PSG transfer would still work.
I saw a news report today where some PSG ultras help up a banner than said something like like "if Vlahovic goes to Paris they will cut off three of his fingers"
Details of the report said the issue came from a time when Vlahovic made a certain celebration after scoring or whatever. I don't know how serious that might be, but things like this can be serious enough for the player or the club or both parties to start having second thoughts.
Juventus wants to sell Vlahovic because they need to sell to balance their books and they need money. It's not because they don't need him any more. I believe it they get Lukaku they would sell Kean.
Since Harry Kane declared that he is not interested to play with PSG, he prefer to go to Bundesliga with Bayern Munich, then Vlahovic will be the target of PSG.
As far as I am aware of, the player accepted 5 years deal with PSG and it is up to Juventus to accept the offer and let the player walk away.
For the supporters, I think they are overreacting and they will not be crazier than Manchester United ones..
Juventus fans did not want him to go as Vlahovic is a promising player but Paris SG may sign him due to their strong economic situation. Vlahovic may have wanted to leave the team after the troubled process of Juventus last year, so it is not right to blame anyone. After all, he is a professional football player and can take whatever decision he wants.