Who's making these
Sarebbe la scelta giusta. Juventus is the best option for him currently.
Going to clubs like Napoli or Roma would be a clear downgrade with a risk of never getting back on track seeing he's already 27. Whereas Juve is in a reconstruction phase which seemingly is finely getting momentum with a promising young coach like Thiago Motta and encouraging transfer campaign so far which sees redundant players finely being shipped and replaced with young and interesting players. Not to mention we're back in the CL and be playing club WC.
Taking that 1yr extension to prove himself wouldn't be a step back but a side step at worst. Have a good season and he'll get a new long term contract from Juve or some serious clubs from abroad will show interest. Unless he's afraid he will never regain his form again and wants to grab that last decent contract now before he's found out. If that's the case then good riddance.