I like Dejuan, I just don't see how he fits into the Spurs' plans. He's a good hustle guy who can play great defense when he gets the right matchup (posts who rely on quickness and don't have great "over the top" moves), but so far he hasn't shown that he is a guy who can go out there and consistently score and defend.
He is what he is, which is ok but when you look at the post lineup the Spurs are working with it's hard to see any minutes for Blair.
They've got Duncan for everything, Splitter for pretty good help defense and running the pick and roll and working the baseline, Diaw as the stretch 4/5 and good position defender, and now Baynes is looking like he has a chance to be the rebounder and all-around defender the Spurs have been looking for since the last title run. That's 4 posts, and Diaw is the only one whose role Blair might be able to fill.
It doesn't hurt anything to keep Blair to soak up some regular season minutes, but maybe the Spurs think they can replace him with a piece that fits a little better or a project with a higher ceiling.
I'm also kind of wondering about Neal's future. His shot selection is getting worse and worse, which puts his "instant offense" role in jeopardy, and his defense is getting pretty bad as well. His minutes and touches seem to be falling off a little. He's clearly never going to be a point guard and the Spurs have Green, Mills, and Manu to fill the 2-guard spot. If they can get a pick for him, I think I'd take it. He could probably start for a few teams in the league.
The shadow over everything the Spurs do these days is that they have to start working out the succession plan for Pop, Duncan, and to a lesser extent Ginobili. There are no Duncans out there, and precious few coaches in Pop's league. Young Ginobili has already been replaced with old Ginobili, so that's not the problem it would have been 5 years ago.