I believe all the shit we hear from his agent is in the hopes of selling him to the highest bidder. His agent has financial motives, which is understandable.
In the end, it'll be up to Berardi to decide. Him being an Inter fan doesn't mean anything, Chiellini was a Milan fan, etc. Did you see Berardi celebrate when he scored the winner vs. Inter? The kid wants to play, he wants to be part of a project, and he wants to grow his career. I could understand his fears of joining Juve, but he's going to have to have balls like Dybala and really prove he's worth the hype.
Another thing is the tactical issues. Where does Berardi slot in? The obvious answer is at RWB, I think he could do just fine there...we'll lose some defence but increase in offence. I don't think he'd be worse then Cuadrado tracking back, but I think he'd more potent than Cuadrado in attack. Another option is maybe in the "trequartista" spot in the 4-3-1-2. More of a free role though, receive & distribute the ball centrally or drift out wide to send in a cross or cut inside the box. Another option is obviously SS.
What I think will happen this summer: Real Madrid will take their 30M option for Morata, we'll reinvest that money back into Berardi. Then its up to Allegri to figure out where Berardi fits most optimally (RWB, AM, SS) and then Marotta fills in the gaps from there.
I really think he's talented and he could do well here but in the end if he doesn't come here its because he didn't have the courage and the confidence to take the next step. (Dybala and Zaza did). It would be a shame to see talent like that go to waste, but Juve will live on with or without him.