if Berbatov is driven (and Conte can certainly provide this) he can be very good to Juve. He's got great skills to keep possesion. He's slow, but very intelligent and classy - so age is not a real problem.
The issue here is his motivation. If Conte can guarantee that, than things can work out really well. And Giovinco is there to pressure Vucinic for a spot and guarantee he's not that lazy too.