Yeah, we should basically be preparing for Smart's departure if he is expected to get anywhere near this. I basically agree with everything SL said and am afraid that Marcus is going to show improvement, but not enough to commit $20M+/yr to him. I am not saying he isn't a useful player; he does what he does better than anybody else, but if he isn't even going to be a starter, we can't devote the contract/tax dollars to him.
I am all for him making his jump next year after he signs his new Roberson-like contract or him exploding into a legit All-star max-level Guard - unfortunately, neither of those seem likely. It seems we just have to hope that no bottom-feeder teams offer him big money. Luckily, some of that money is drying up.