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If we compare Real Madrid with PSG, maybe it is wrong because in terms of experience and quality, these two teams are different and Real Madrid has become the king of the Champions League. I am not so optimistic that PSG will be able to defend their second trophy in a row for next season because there are many challenges that they will get and also many teams are starting to fix their squads to look stronger when facing competition in the Champions League next season.
When PSG won the champions league in this previous season, nobody knew they would be the winners. And so we can't rule out that they can't do it in a row. Records are created when least expected, and as at those periods Real Madrid had to win the UCL back to back in a row little did any of us thought they could do it. PSG, right now has that quality and the experience provided that they have won the league, unlike before.
You are absolutely correct no one can tell if they are going to win the champions league back to back but for me, even if though they played am amazing football last season I doubt if they can actually do that but if it happens congratulations to them. Remember individual league is way different from champions league and so the fact that they have been wining there league currently doesn't justify or mean anything in the champions league and talking about when Real Madrid was winning back to back, yea no one was sure it will happen but there appearance those years was outstanding I mean incomparable with other teams. However, PSG can only do that if they are consistent or better still improve more.