It's a cycle every league goes through. The problem is that Serie A fucked itself over the years.
True, but you can't blame a Juve fan not to be so entertained just by winning THIS league only.
Not quite true. Both the Brazilian and Italian league were strong since the beginning, pretty much, There was no cycle. Calciopoli was just the nail in the coffin, it was already decreasing in overall quality since the late 90's. The fact Juventus, Milan and later Inter (and Ocassionally Roma) had strong teams doesn't represent the rest of the league then.
I always compare those 2 leagues because they're in pretty similar situations. They were two of the greatest footballing nations with the strongest leagues but so culturally flawed. They got no one to blame but their own people/confederation. Hustini is right about that.