It's like the last years of Wenger at Arsenal, people scapegoated him way too much. The bigger picture is that Allegri will have to go, we'll have to change our transfer policy, sort our finances out, and just break down some of our barriers ie, hiring only Italian managers, for us to succeed.
A good transfer window might be what Allegri needs to return to winning ways but he'll fall short and it's at that moment, we make the right choice to replace him. Allegri is just one of many dickheads at the club but right now, we should focus on improving the whole club. I'd love Zidane but the squad isn't right for him to work his CL magic whereas it's perfect for De Zerbi to change our style, but at the cost of not winning anything.