Nobody knows what will happen with those kids, but if they stay healthy and don't get drafted by Cleveland, they will be great players. I don't know about Smart and Exum, but Parker, Wiggins, Randle and Embiid will be All Stars if they stay healthy and away from the Cavaliers.
Then you have Aaron Gordon, James Young, Dario Saric, Cauley-Stein... I bet they'll be above-average starters. McDermott, Gary Harris, Vonleh, McGary, Isiah Austin, Dinwiddie, all good potential players. Then, some dark horses like Nurkic, TJ Warren, Jerami Grant, Montrezl Harrell and well-regarded players like Rodney Hood, Glenn Robinson, Dekker, Selden, Semaj Christon.
I think this year's first round is full of solid picks, and this Draft is very good from 1 to 10. I think we won't be picking in the top 5, but if the Celtics had the #1 pick, they should take Embiid. Parker and Randle will struggle to adapt to NBA game and defenses, but they're too talented to not succeed. Embiid and Wiggins will thrive in the well-spaced NBA settings, their athleticism will help them to develop if they're willing to put the time and effort to improve their skills.