I am in the camp that says let him earn his minutes, don't just give them to him. I think that the coaching staff feels the same. I'll use last Monday's game vs the '6ers as an example.
It was a blowout, Gino-time affair, and Young only played 2:57, with a stat line of all 0s except 1PF with a -2 +/-, and Young was one of only 3 players (himself, Randolph and Pressey) to have a - associated with his name.
http://www.nba.com/games/20150316/PHIBOS/gameinfo.html?ls=eref:google:1b:postI hope his attitude isn't a concern. I was at that game and not only did he look lost out there, it looked like he didnn't give a crap.
I was sitting down the end (the opposite end from their bench) where the Cs where warming up prior to the 2nd half.
His body language and casualness concerned me.
Prior to the 2nd half, he was taking threes from the right corner, and I think he made one of about 8 and just seemed to be going through the motions, shoulders slumped, just heaving them up, no lift from his legs at all, like he wasn't even trying. Then some short, bald guy in a suit (don't know who he was) seemed to be instructing him on the court, and it didn't seem like he gave a crap, as he missed about 4 more as he moved slightly around the 3 pt arc, but he did elevate a little more.
Just my impressions, and I no doubt could be wrong. I hope that I am.
EDIT: Again, as others have said, it could be his age, and I have used this excuse before, defending him in the past myself. Maybe if Smart and his work ethic and tenacity wasn't here to compare him to, I'd be a lot more understanding.