You can't say that for certain. For all we know sarri could win us the cl next year or fail miserably.
We should reserve judgment after at least half a season.
You have to agree that if juve wouldn't be miles ahead of the competition and had a great coach sarri would have won at least one scudetto.
I agree that we can only judge the result latter (If I am right it wont be at the end of the season), but until now he has show nothing that makes me change my mind or makes me think that maybe he can lead us to CL...
In his short time in charge:
1. Has probe to be a "Yes Man"
2. Has alredy make excuses that "My teams always suffers at the beginning of the year"
3. Has not help in anyway to our transfer strategy and in fact made it worst (Go to point 1) by not talking to players like Higuain and tell him that he is not part of the teams plans and also now, asking to keep Khedira.
Again, I agree we can only judge him later, but until now, he is everything I knew he was...in a bad way.