PSG has only one obstacle that might make things complicated for them. Chelsea is the only club that have defeated PSG in their best form and I believe that if they clash early in the knockout stage, PSG might find it difficult to win Chelsea. However, there are other strong clubs that van stop PSG from defending the title next season.
PSG simply needs to improve their emotional state when they lose early against any opponent. If they immediately show their emotions just because they can't take the lead early, their opponents will easily exploit them, leading to a crushing defeat later in the match. I truly didn't expect PSG to lose so badly against Chelsea in the Club World Cup final, but in the Champions League, I don't think the same thing will happen to PSG again if they no longer let their emotions play out after losing early in the first half.
Few predicted Paris Saint-Germain would lose to Chelsea, but that's exactly what happened. I wonder if this was due to their overconfidence, leading them to underestimate Chelsea? It's just my opinion, but it could have happened to them, leading them to suffer such a crushing defeat.
This is a valuable lesson for them, as a defeat like this will make them better prepared. And if what I say is true, then they shouldn't repeat the same mistake in the future. Their goal is definitely to defend their title, and they will work hard to achieve that.