Great teams are helped and hurt every year by the NFL draft. Hurt because their best juniors leave, but helped because it opens doors for other great players, frees up scholarships and attracts great players who know that they will play early at a school that moves players out to the NFL so quickly.
What Clemson managed to do this year will help them in the short term, but may hurt them down the road. Keeping so many great players who are ready for the NFL will hurt their development of other players in their existing player pipeline while also keeping them from signing a few players who will be around for more than one more season.
In other words, IMO, this is only good for Clemson if they win it all next year. As good as Alabama will be next year, I just don't see that happening.