Assuming it's an 82gm season, why wouldn't he have a shot at 40pts?
He's playing with the next great group of offensive players. He's going to be given every chance in the world alongside them. He was lusted after by about 20 (or more) teams, which leads me to think he's got legit skill. And he's basically got no competition for PP time (with apologies to Whitney and, I dunno, Potter).
Shattenkirk had 43pts in a later start split between an okay scoring team in Col and a low-scoring team in StL.
Fowler had 40 on a high-scoring Ducks team that had a huge PP.
Subban had 38pts in Montreal as a rookie.
John Carlson had 37 with Washington.
Jake Gardiner just had 30pts in Toronto, but only 7 pp points.
The point is - Schultz may not hit 40. In fact, it would be a really good rookie year if he did. But to say he has no chance is ridiculous. His situation is about as good as it can get for a young, offensive-minded defensman.
Just because he didn't sign with your team doesn't automatically mean Schultz is an over-rated dog.