i don't agree with hustini and wouldn't blame it all on calciopoli, but that's quite a surprisingly lazy explanation from you. italy got it wrong lately on so many levels: they haven't got enough faith in youth players, their u21 is pretty consistent, still, their young players often fail to make it to the next level, their stadiums are old, clubs' financing never recovered after calciopoli, their leadership consists of dinosaurs (quote from cannavaro, but he's right about it), italy is not united and it's widely accepted that other clubs are trying to beat juve at the green table once again, their nt coach selection for this wc campaign was a complete miss, etc.
just one thing: tavecchio, an old, bigot, racist man with a remarkable criminal record, has only got 3 'no' votes from the 20 serie a clubs when he was elected. (juve, roma and torino voted against him.) he's the trump of world's football, without the wealth our favorite donald has. that's not some bad luck.
btw during the last decade, italy have been more successful than belgium on u21 level. still, the belgian nt is way ahead of italy at the moment. that's not just bad luck: young belgian players are simply better managed.