I don't think there is anything certain about Vilardi being rushed. He hasn't even played a full NHL season yet, and even with his crappy start he would be on a pace for 35 points in his first 82 games. Those aren't grinder numbers, even without the top line minutes. This is the exact same argument we heard with Brown and Simmonds, whom Vilardi has put up better numbers than, yet it didn't affect their careers negatively whatsoever. You could also make the case in the opposite direction for a lot of guys, each player is different. A lot of guys who are putting a ton of points up are following the same path as GV.
What I've found is the best guys always excel anyways, regardless if they play more in the minors or if they come up quickly. Development helps of course, but it's really on the player and their strengths. I think guys who need defensive work are the ones who benefit, you don't really develop offense.
If Vilardi falls apart, it won't be because he was rushed, rather he just wasn't at the level he needed to be.