I personally wish him the best of luck if he plays at a level that draws first round NBA draft status. I'd even be happy if he received that kind of attention for the 2017 draft, leaving after his sophomore campaign. If he is hearing whispers of early second, late first round, I hope he stays for another year, but if he is hearing mid-first round or sooner then he should go for two reasons. 1. it could be the highest his stock gets and he shouldn't risk injury for marginal gains - the NBA players are playing for that second contract and the pay difference between 40th pick and 15th would be worth going after sophomore year. 2. If he's playing that well, then the Bearcats are playing well as a team.
If JD3 leaves as mid or early first round pick in 2018 (after junior year) that'd be a great UC career for him too. Do I want four year players - yes. However, I don't want a kid to stay four years if it adds no value to him - I'm okay with players leaving early on occasion, but don't want him to make same mistake as Satterfield. DJ and Dantonio could've been helped by at least one more year, but both had high ceilings and lot's of potential. Kenny listened to the wrong people. I think JD3 will listen to the right people and has a high ceiling at the next level.
One thing I look for in an early draftee is that he makes the players around him better. JD3 can open things up for Gary to shine too.