We just played a CL final and did pretty good against one of the best attacks in history. Don't think its lack of motivation.
So what? We lost anyways. And he also has won evrything available in italy, bar a top scorer place.
Im not saying he has nothign to play for here, but lets be honest, we will for sure steamroll serie A againn and coppa italia is cute and all but not a big deal, we got our 10th anyways.... now expect 10 years more without coppa. Our sole purpouse this season will be to keep our pace in the CL and try to win it. Also, who knows what the board and allegri plans with dybala...
Also, maybe it could be money. He deserves better, he is in his prime and has paid us with lots of goals. If the board doesnt want to give him the money (im guessing here) he is in all his right to leave.
Now, lets look on the other end. La liga. He has never played theres, he would be under simeone. That league is miles ahead of serie A and the sole prospect of beating real and barca, 2 teams way better than anything in serie A can offer, plus coppa del rey plus CL, seems to be more than enought drive to go at it once again.
Maybe he loves juve, and I think he really does, but he always have been of nomad nature. Maybe he just got bored and doesnt like to not have the drive for it so he prefers to leave