Are you sure? The judgment is delivered at the gate. Italian football attendances have fallen and fallen and fallen. Some of this is the tedious football, no doubt. But the endless diving must be a consideration too. It's punishing to watch.
Last night Barella was awful. But not untypical. I wouldn't want anyone that weak and unable to cope with basic gravity near Anfield.
The average attendance in Serie A (across clubs) is about 29k this season. That stacks up quite favourably with the average attendances about 20 years ago.
The hey day of Serie A in terms of attendances was post Italia90 when the league was in it's pomp and they had redeveloped stadiums as part fo the World Cup.
There may effects of style of play, play acting and quality of football that played a role in the decreasing Serie A attendances between early 90's and mid 00's. But that discounts the reasons around poorer stadia, fan safety, the changes in Seie A clubs (less Bari, Genoa for instance who brought up average attendances) etc.. that will have impacted the decline.
I think with the new stadia (like Juve, Udinese and in the future Milan) and some success in Europe you will see a continually trend in Serie A attendances going up.
I'm not a fan of Serie A personally. Not the current version. Late 80's to early 00's Serie A is the best and most competitive domestic competition I think there has been. I loved watching Serie A in those days on Sgorio and latterly on C4.