It's all about what the player has in his head and heart, gents. We know Juventus ultimately can't compete with Barca for wages or exposure right now -- although management is building something great, and the club could still ostensibly give Pogba a decent raise -- Gigi and Ale were making over 6. It really depends on the desires of the individual.
Some marry for love, others for money, some for a specific/unique quality of life. Pogba is so young still, he has so much time to learn and grow. I think scenarios could exist where he settles into this group/club further, and stays beyond 2016 -- even if the likelihood seems to be that he'll be sold for a huge amount after the 2016 Euros.
Just ignore the noise from Barca right now. Election + transfer ban = bulllllllllshit.