There have been plenty of speculations about why he still hasn't extended his contract. According to Italian media, one of the problems was that he didn't have an agent with a professional license. Not really sure how that is possible and how he was able to work with that agent in the past. Juventus is also questioning if Paulo is worth the money he asks for. It's a fact that Dybala is not a 30 goals per season type of striker and the management is correct in questioning should we pay this lad €10/year. It would be awful to lose him for free though, especially if he goes to Inter.
The injury seems to be the main problem for Dybala right now. The management is also right to question his worth because generally if you pay for something you would want something in return.
That's where the injury case has made things worse. And losing him for free would surely be a great shame. But, I think that he could have made a great duo with Dušan Vlahović.