Juventus know that if they sack Allegri, they must put the club into hands of a new coach. There is no guarantee that a new coach will be able to sort out this crisis. Allegri has had many seasons in Juventus and he understands about the club deeply. A new coach is not familiar with many of things there. I believe Juventus will give Allegri more time and they will make decision after the World Cup that ends in December.
Before sacking Allegri, Juventus must have the best candidate to fill the position left by Allegri. Every action taken must have careful planning, maybe Juventus are looking for the right coach before they sack Allegri. With Juventus' performance increasingly unclear, Juventus staff will not be able to calm down seeing their team struggling to improve their ranking in the standings. The change of coach is a solution for Juventus to get out of the problems they are facing.
Juventus must reflect on Chelsea who dared to take a stand by sacking Tuchel, after Chelsea squad was led by a new coach, they are now growing and winning victory after victory. Juventus have to do that if they don't want to sink further into the table.