That said, Relying on any WR in year one and all but very few rookies can be disastrous. RB's, DB's, and LB's for the most part are the only rookies that typically make big impacts as rookies in fantasy.
DK's stock did get a boost with Baldwin being released today so his playing time and targets should increase. He has a chance to be effective this season based on the routes he will run and the QB's ability to actually deliver the ball is way above average but DK is only scratching the surface at this point.
I believe he will be a stud in this league once he learns the game but as rookie no one should have false illusions because it takes most WR's a year or two to see how they adapt.
Given the situation though, he could put up surprisingly good numbers as a rookie.