When I did my preseason practice report prior to the season, I reported how one of the SU staffers indicated that the coaches viewed MCW as a legit NBA prospect. Not just someone who will garner consideration, but a player that they expect to eventually be a shoo-in first round pick. Kid was a McD's, and showed a lot of moxie intermittently when he played last year. There is no doubt in my mind that if our roster had been constructed differently, then he could have handled playing more and would have been a solid contributor.
That said, I don't agree with your assessment of how last year would have unfolded. For a variety of reasons, MCW was the fourth guard in what was primarily a three guard rotation. JB sees these guys in practice every day, and I trust his decision making about how to distribute the minutes. There were times when all four of the guards sat. There were times when Scoop--our 5th year senior--found himself on the bench while Dion and Triche finished games. There was a stretch when Dion was mired in a slump, and Scoop / Triche played more. And there were certainly plenty of times when Triche found himself on the bench.
MCW not playing a ton last year isn't an indictment of his ability--and will have no bearing on how the rest of his career here plays out. Playing behind a more experienced guard trio might actually benefit him in the long run, since he was so skinny last year, and he had the opportunity to be shown the ropes, and also since Scoop took him under his wing. I think that next year, MCW is going to be much more prepared to be an impact lead guard than he would have been last year, regardless of his natural ability. I have some [minor] concerns about his physique, his ball handling / high dribble, and his ability to handle pressure. I'm really looking forward to seeing MCW dispel those concerns. It's his team now--there won't be any more sitting.
