You can say anything, but in the world of football, the impossible is the surprise that is awaited. That's what I mean, PSG has a chance, it doesn't mean they will achieve it easily, but if they can be consistent like this season, I think they can do it again next season.
Of course, the Champions League is a more difficult competition because every big team competes to show their greatness in the highest competition. Of course, with what PSG presented last season, of course they were much better at defeating their opponents. You have to see it and prove that PSG is not a weak team anymore.
If Real Madrid, for example, had shown the performance this year that they used to show with Zidane as coach, PSG would have had no chance of winning the CL title. This year all the big teams weren't that strong, which is why PSG had an easy game and won the CL, but next year there will definitely be a lot of competition and especially Xabi Alonso with Real - I expect a lot from the team!
You are right Real Madrid was not as strong as they used to be when they won the champions League back to back likewise other teams like Manchester City but Barcelona and Liverpool was the teams that were expected to win the champions league but when they couldn't make it to the finals it became very easy for PSG. Next season Real Madrid is preparing to come out better under a new manager and some additional players it's going to be interesting.