Mate, I cheer for Bonucci and Marchisio when they play for Italy. Think about that.
The point being made is that it's beneficial for us if they perform on NT level. Even if only we look at the aspect of few of these putting in good performances that might attract some interest, consequently making it easier for Juve to offload them, Giach for instance.
On a sporting level we get confident and internationally more experienced players, which is again direct benefit for us.