I kind of disagree with that part because at the end of the day the manager doesn't play, the players do. You can be the best manager in the world but if the players are mediocre probably you're going to fail. Italy could even hire Guardiola (hypothetically of course) but that wouldn't mean that we're going to the world cup. Do you remember Ancelotti with Napoli and Everton? Great coach, mediocre players, mediocre results.
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.
This is main problem with them quality and skills are going at their lowest level which is big drain for them and nothing positive is happening for the improvement of players skills here Italian soccer needs to work on before it brings no return way for them. Already lost their spot in world cup for last two times while third is also under trouble no big coach is ready to accept this challenge with current new coach is already had serious pressure few concerns are right because things are not positive with Italian soccer mediocre players have never been able to give good results while coach is world-class.
Even this is now long project, but they needed to started quickly and have some good session which increase players depth and also give them good opportunity which allow having some technique because without having any big step now they are not going to have better results.