The thing is, the NBA knows he's not gonna shoot 55 to 60% of his 3s for his career. So when it comes to this specific part of his game, Reed just needs to not have his 3pt % fall below 37-38% on the year.. which I'm almost sure won't happen.
The NBAs concern with Reed is, is he mature enough to handle the rigors and grown men of the NBA. That was really his only knock this year, he just sometimes seemed lost and overwhelmed by more physical teams, and when that happened he would sometimes shrivel, play off the ball, not demand the ball. All things he can prove the NBA wrong next year and possibly RAISE his draft stock.. or at the very least keep it the same.