If PSG does not win the Champions League title, I agree that a few things are about to change. There are a couple of significant players for PSG who will be departing the team and that is to be expected. In spite of the fact that the PSG have a very strong team, they can at times be very inconsistent when it comes to their performance. PSG needs to avoid those situations.
In addition, although all of the players are doing well individually, there does seem to be a lack of chemistry between a few of the players in the squad as a whole. As a result, a lot of problems can arise due to that. In the current season of League 1, Paris Saint-Germain is doing very well. We will have to wait and see if they are able to perform adequately in the Champions League.
I feel like there is an overreacting to UCL, it's not an easy cup to win and there shouldn't be a pressure on the players. In any case, Mbappe is very very young, he will still be playing football after Messi and Neymar retires, which means that we could see the owners building a whole team around him yet again and again, maybe get some other known players.
Like for example, everyone talks about Jude Bellingham going to premier league as an English player, what if PSG ends up paying him good money to go there? If they can build a team of players age 25 or under, to surround Mbappe with great talent, then even if they don't win now, they can win 5-6 years later with that roster.
Honestly, I do not think it is going to work well if they want to build a young team around Mbappé, because he is already feeling like he is the Prince Charming of the team. He also has authority over other players. So it is not going to work well because the other players will feel like they are not being treated equally. And meanwhile, Mbappe will keep disrespecting other players. If they actually build a team around him, I think The other players will suffer from an inferiority complex.
I think if they have to build a team around him, they should at least strip him of the power that they have given first. After all, he is a player, not someone in the authority.