Count me among the skeptical. I don't expect him to be a positive contributor, which is not necessarily the same as getting playing time.
I think he's a bigger Kendall Marshall. Enough skills to play, but so athletically poor that he'll never be a reliable contributor on a contender, because in the playoffs his defense will be abused even more. Marshall has been on 4 teams and waived 4 times. But he had the skills to be a lottery pick, he just couldn't hang athletically. That's Anderson.
He might be saved the indignity of multiple trades and waives because San Antonio won't have the salary to push around in trades, but he has that bad combination of being slow and lacking hustle. Moving like Mr Burns through jello is one thing, but there were plays in his brief on court time when he sure looked like he was taking defense off or not getting back with the full extent of his limited top speed. Has he gotten over himself enough to recognize that his career is in jeopardy if he doesn't go 100%? He sure seemed en led, going through the whole draft process carrying too much body fat when he know everyone was doubting his speed, talking about how he'll never slip to the spurs, etc.
Maybe in summer league without having to feature Austin Daye and Jeff Ayres and with a leaner body he'll show proof that he wants to succeed and goes as hard as his body allows. Because if he suffers under the belief that he's so good he doesn't have to lower himself to be a hustle guy every play like so many are forced to be (and caused Green to be cut once), if he thinks that just because he was some big shot at UCLA he deserves the ball in his hands every play like he's Magic, if he isn't willing to do everything at all times then he'll be joining former 2nd round pick Marcus Williams in Europe after being a d-league superstar.