I don't think that it's a travesty to tell a guy "I understand you're concerned about playing time, BUT, our 5 is 95% declaring for the draft after this season. I've seen him play and I have spoke with scouts who have said that he will be drafted if he declares. If you want to wait until the spring signing period, that's fine, but we'll have a spot for you."
If Boeheim thinks that Coleman's game will play in the NBA, I don't think he's going to stop the kid from declaring, hell, he'll probably encourage it.
Roberson and Dakari would cap one helluva class that people were shitting on in September.