Only holds 41,000 though.
In an ideal World we need 60-70,000 capacity over 3 closeable tiers. Lower = 25,000. Middle = 15-25,000. Upper = 15-20,000 in order for it to satisfy all needs. i.e: 25,000 capacity for LC/SC SF's between smaller teams & unattractive Int. friendlies. 40-50,000 for LC/SC Finals between non OF* teams and your typical Int. fixtures and 60-70,000 for OF* Cup Finals/SF's as well as key Int. matches.
You're right though, Juve's stadium is a cracker and something to be modeled on.