I don't think Messi is the only reason, because they have a lot of star players who drain their pockets, including Mbappe who gets a lot of privileges. Now I wonder if they will stick with their habit of signing other top players, or they will change their habits by focusing on team regeneration. They often do it with top players, but the result is a failure. Now I just want to see them do something new, for example like the second point I said before, namely by regenerating players. I haven't seen doing that before, and I think Paris Saint Germain should try it.
I know the main reason why they like to spend money because they have good finances, but until when are they going to do that?
PSG is a premier team in Ligue One and in football; they are incredibly competent and financially strong, capable of bringing in any world-class star. Leo Messi and Neymar Jr will leave the club, but they have yet to announce their next move, as fans continue to boo Messi and Neymar on the field. The biggest issue for the Parisians is a lack of strength and gaming experience to compete with other elite clubs in key events like as the UCL. The team requires good working coordination among the players as well as a coach with extensive expertise. Christophe Galtier can fill the shoes but is incompetent to handle business over there; the problem is larger than he can handle. I recommend Jose Mourinho or Anthonio Conte who knows exactly how to manage elite clubs.
They didn't lack strength and experience, in fact they had it a long time ago. But what happened here is that they are not harmonious between one player and another, not to mention that external problems have arisen, as you said, the fans have started to dislike the players. That was clearly a problem, any player wouldn't be comfortable with pressure, let alone the pressure being unreasonable such as booing and even starting to attack individually. I understand that the fans are not satisfied with what Paris Saint Germain has received, but the move they are taking is also not justified. Apart from all parties who have to be responsible, I think it is the management who should be more responsible, because they seem to be wrong in managing this team.