Usually deep lying playmakers develop their passing through-out their career, and Blind has already showed signs of having a great range of passing. It is clearly not at the level of Carrick/Pirlo/Alonso and so forth, but Carrick at the age of Blind didn't have that kind of passing range either and neither did Scholes.
Blind has an excellent defensive midfield game with a fairly strong passing. There hasn't been many deep lying playmakers who managed to combine a world class defense with the passing range and playmaking that defines the role.
I think we will just stare ourselves blind if we want to compare him to Carrick all the time, if he doesn't develop the passing range of a DLP then that is fine anyhow. There is nothing wrong if he goes the other way and develops his defensive side even further while remaining more of a metronome player on the ball.
He's already world class on the ball for a defensive midfielder, only the few deep lying playmakers are a fair bit better on the ball than him. Busquets, Verratti, Carrick, Pirlo, Alonso etc.