Currently the Italian national team is filled with mediocre players, there are no outstanding players, unlike their era in the 2000s. So it is very difficult to be able to revive the Italian national team now, even when it is the most experienced coach, because as you said the role of quality players is very important, and then we discuss the manager. Because now the problem of the Italian national team is very complex, so changing the coach alone will not be able to solve the problem, there needs to be a total overhaul from the roots of the Italian football system, and the process can take years.
Seems the days of Italian domination in football has quietly faded away because these days it is so hard to get qualification to compete in global tournaments. With the current squad we can only hope they can still secure world cup qualification but they are not even topping their group ao it is hard to tell if they will.