Allegri has not done that bad with Juventus in my opinion. I believe if Juventus had not faced so many problems that they have been facing in the last few seasons, the performance could have been far better from them. But I also understand if they actually want to change the coach because they have not been able to bring in as good results as it was probably expected from them. I just actually wanted to see how Allegri does with Juventus in normal season. In a season where they will not have so many problems. And even though Juventus is actually going to perform in the Champions League next season, I do not think that the authority of Juventus is actually satisfied with the result that they are watching right now. If they are able to win the Coppa Italia, then the decision might be different. Otherwise, I think Allegri is getting sacked.
I think it is never the right way to just put the blame onto one person. That's why saying Allegri is the one and only to take responsibility for messing up the end of the season is not correct. The players have responsibility to and I am confused how they can allow for things to become so critical that they now have to fear for their Champions League qualification. 2 months ago nobody expected them to lose points nonstop and suddenly be under pressure again to make the cut.
But in the end it is normally the coach who is responsible. I have no clue how Juventus could drop so hard in performance. It is very atypical. But that's the business and if they really miss the CL, I think Allegri can pack his bags and go.