Ronaldo only contributed a little for Juventus I mean, Ronaldo came to Juventus when Juventus had won his consecutive title and Ronaldo didn't start from the beginning for the Juventus title streak. That's why I say Ronaldo has only contributed a little to Juventus, so with his departure I don't think it's a problem. There will always be times where they succeed and fail and this is part of a good competition, because if Juventus continued to win titles, Serie A would not be interesting. Also, according to rumors that at least Juventus will get top players, hopefully that will come true about Di Maria and Pogba and Juventus back in the title race next season.
Juventus dominated the Serie A title for a long time, which was won in a row from the 2011-2012 season to the 2019-2020 season. Juventus seems unmatched in Serie A with a total of 9 consecutive titles in 11 seasons and they have only failed in the last 2 seasons. Last season Inter managed to break the dominance of Juventus, and this season Milan became the second team to win it in the last 11 seasons.
Maybe Juventus can get him back next season especially if they manage to bring some good players into their squad. Pogba and Di Maria are good for them, so if both manage to sign contracts and agree to join then Juventus will be even better next season. But as a football fan, I don't think one team's dominance in one of Europe's big leagues is good because to be honest it's proof there is no equal competition for the other teams that participate every season.