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I also think they can defend their championship in the French league, but when it comes to the Champions League, the probability may be lower. Because when you go to the eliminations outside of the group stage, every team can get surprising results. This year, the fight between Barcelona and Inter was the simplest example of this. While everyone expected Barcelona to win easily, Inter eliminated them. They made it to the final and played very badly against Paris Saint-Germain in the final. I don't know if Barcelona could have won the cup if they had made it to the final, but football is such a game, that's what I want to say.
It is very difficult to expect PSG to be able to defend the Champions League title next season, they might fail before the semi-finals. But we never know for sure what will happen in the future, a new record is possible and it can be achieved by any team. I am happy to see PSG win their first Champions League title, but defending it is much more difficult than winning the first one.
The two Spanish teams between Barcelona and Real Madrid are the favorites, while Liverpool and Manchester City will also be in the list. I don't see PSG at the top of the list of favorites next season, but this is just an assumption that could be wrong later. If PSG can retain the title, then it will be a miracle for them.