Honestly, I don't think most people are calling for his head. He definitely needs to learn a few lessons and people are pissed off about that. But i bet most people here have seen enough of how Levy operates to not - yet again - just blindly shift blame to the manager.
If the last 25 years have showed anything, it's that it's very difficult to compete for trophies under Levy. We have had every type of manager you can get, from the cheeky veterans to the proven winners, to the up and comers...nobody wins here. All we can do is hope that Levy throws enough darts at the board to one day stumble on the exception to the rule. Hopefully it's Ange, we will see.