I think the decline experienced by the Italian National Team also indicates the competitive level of Serie A. We realize that Serie A is also not as competitive as it used to be, this also indirectly contributes to the decline of Italy best talents. In fact, we no longer see defenders who have talents approaching the level of Bonucci and Chiellini in the Italian National Team defense, we also don't find players of the level of Jerginho or Verratti in the midfield, and the same goes for the front line. The Italian National Team looks like they have lost their golden generation, they clearly have to find a solution for this. In the past we saw Juventus, AC Milan, Inter Milan, AS Roma, Lazio players as the mainstays in the Italian National Team. Currently I think only Donnarumma can be considered a world class player in the Italian National Team.
It is indeed apparent that the quality of Serie A is not as competitive as it used to be. In the 1990s and early 2000s we could see that Serie A was arguably the top league in the world, it produced the best players, the best coaches, and its stadiums were so beautiful. But now the quality of Serie A has declined drastically, because it is too much in its comfort zone and they do not want to innovate and make the quality of their league more competitive with other European leagues.
And the impact is seen that the quality of their national team has declined, because they lost their golden generation. They failed to create a competitive league to supply the best talent to their national team. Now the best players from Italy can be counted, the rest look ordinary, and this makes it difficult for them to compete.