More to the point, ATL has three first round picks that are all higher than the Spurs' pick - 8, 10, and 17. Not only that, but they own the 35 and 41 picks, which have a good chance of landing a sleeper and/or a high-upside project. They also have a load of cap room to absorb the contracts of a couple of proven, high-profile veterans. There's absolutely no way that they're going to settle for three rookies, IMO. Get a good vet or two, and you know what your rookies have to mesh with. 8 has the most value, carries the most leverage for them in acquiring a good vet player. So unless there's somebody they just really love and don't want to risk going to Chicago (or their trade partner), I think that's the pick they'll move.
I hate to even say this out loud, but it may be one of the few places where DDR's contract is actually moveable. I know people here about him, but he's worth a lot of regular season wins, especially in the East. If the team plays a wide-open style, he's dynamic and should fill some seats. Honestly, there aren't many available players who they could count on for more.
I hope it's not for Doumbouya. I know a lot of people are sold on him, but I don't like spending that much to trade up that far, and still having that much risk.
I'm not advocating it, or saying that it will happen. But if the Spurs are going to move up, there aren't many scenarios I see that are more likely. To be honest, I really kind of covet that 35 pick that the Hawks are holding, too. I think there will be some steals in the early second round, for the teams that can find them.