I'm biased, but in my opinion certainly not, I'll give you two examples why I think so.
Lewa is not just the striker of the decade imo (in close competition with Suarez), but also one of the best strikers ever. In terms of pure skills, ability to read the game, positioning, finishing, stamina, mentality and of course longevity is he just amazing.
Of course him and Lewa can't be compared as Lewa is a physical strong striker and Dybala playing more as a CAM/SS.
But to the point concerning Dybala: 3-4 years ago I actually wanted Dybala at Bayern, I thought he'd be the next big thing. If the German media was to be believed KHR was a big admire of Dybala and thought of the idea of Bayern trying to get him.
There's no question regarding the talent of Dybala but I'm not convinced he will get much better at this point. He's also (27-28?), so he won't really develop anymore and this year he seems to have stagnated also because of injuries.
He want 15 mio a year? Juve shouldn't give him that. I don't know what his current salary is, but he should get 11-12 mio max as things stand imo.