We still got it, BenatiaBC, AS and Cuadrado. What made it weaker this season is the lack of Pogba and his 2 way game. The team was built around him and Pjanic was kinda just put in his role which he can't play the way Pogba did. A more dynamic midfield would make it as good as it was last season, a Tolisso or Goretzka or Dahoud would add a lot to it.
Another thing, dont forget the injury crisis we had this season in defense. Even Rugani got injured for a few weeks then after he returned it was Bonucci who was out injured. I dont want to imagine such scenario next season in March/April with 4 CBs (or 5 with the 5th being someone mediocre). Benatia when healthy was a starter next to Bonucci and Chiellini and I think he will be next season too. I see no reason why we should simply pass on him unless the management has serious concerns about his injury
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Having said that, i think it won't be our primary formation next season but I also dont think we will move away from it completely. Neither we should imo