You really agree to retire number 10? That would take away such a magical number from future generations and would certainly be awful to not have a new legends who would wear number 10. It would be an idiotic decision to do this. Maybe some other number, but certainly not the 10 one.
Give it to someone who has proven in Juve, that he deserves it, so far it would mean don't use it for next season. I don't want to see number 10 disgraced like number 11.
To retire a number is retarded!.. I'd give it to Giovinco or a new star (if we sign one) like Lavezzi or Jovetic. If not that, than leave it out for a season.