They are currently considered the favorites to win next year's Champions League by many betting sites. Paris Saint-Germain is a fantastic team and could be in a very good position next year. They may have lost the World Cup final against Chelsea, but that doesn't make them weak or ineffective. They will undoubtedly be the sole favorites to win next year's French league, and they will also be fighting for and potentially winning the Champions League. Of course, a Super Cup match awaits them, and they'll likely start the season with a trophy.
Everyone is free to make their own opinion that's why I cannot dispute what you have said but to me it sounds impossible for them to win the next season Champions League, i am not saying this based on the loss against Chelsea and the FIFA club World Cup final but a lot of teams have realized their mistakes and I'm very confident that they will want to fix that especially now that transfer window is still open. I'm expecting a lot of surprises next season because currently so many teams are building themselves up to face the Challenge head.
But if you talk of French league, winning this trophy is like hobby to them and I don't see any amount of player other teams will buy the can challenge PSG because they are as not as rich as PSG to be able to acquire top players.