I agree with that, Ronaldo was a very good player, but it was not possible to make this team champion alone. In order for a team to be a champion, every player must be successful, players who can score goals or pass well are not enough for this.
I think they have a much worse team this year compared to previous years. They didn't even lead their league
Juventus have gone many steps backward, I'd not say that it's as a result of Ranaldo leaving the team, though that might have contributed to it a little bit, but in my opinion I believe they have lost their flair of playing together as a team, Juventus were so strong in their league and were not doing too badly in the UCL for many years cause they knew how to play together as a team and win, they need to regain that to start winning again. Of course I have to agree with you, they are much worse this season than in previous times, they really have little or no choice of winning the CL, they'll try, but my favorites remain City, Bayern and Real Madrid.