Most people, I would hope, are realistic about that - if Stith could start over Boothe, he would have been more highly recruited. I think he will get off the bench for sure, unlike TyShwan. If he can play 15 minutes a game and not toss the ball into the stands, maybe score a little from the lead guard position, he'll be doing his job.
Also - while the coaching staff is willing to give a player who is earning it (on defense at least) more time on the floor, I don't think Norm benches Malik B., and definitely not right off the bat.