Well i don't think anyone can outrightly say you are wrong in what you say, quite a lot of people, especially PSG fans expected more from the trio of Messi, Neymar and Mbappe, but they are currently not delivering the trophy that PSG fans want, which happens to be the CL. When they were eliminated by Real Madrid last season in the RO16, so many of their fans turned against them and started booing some players during their subsequent Ligue 1 matches, all of these was done to air their displeasure at that elimination.
It is certain that PSG fans, if they lose again, will sneer at the players who cannot advance to the next round, considering that the existing squad and some of the expensive star players cannot provide the trophy that fans want, of course, from losing the season again, remembering them with many shouts that don't like it but that's the reality that PSG with a myriad of great players is still unable to win the UCL trophy and even I doubt it for the current season even though Messi and Mbappe are in it.
PSG players will have that at the back of their minds coming into this second leg game against Bayern Munich, they cannot disappoint their fans twice in a row at exactly the same stage of the competition, but the reality is that they are staring elimination in the face, they are already losing, and they are going to the home of the German champions, which isn't an easy ground to win it, i think Bayern Munich are going to progress to the QF.
Bayern Munich themselves at home have more control and I know how Bayern Munich can survive the situation that will be faced with PSG, maybe this will be the second time again or the joy that will be given after they go to Germany, but still I have predictions that are uncertain, but what is clear is that Bayern's strength there is stronger than PSG.