A trade doesn't always have to be player A is replacing player B. We're shipping Hill because out of the bunch of 2 guards we had that were expendable (Hill/Neal/Anderson), Hill was the one that would bring back more value in return. So we used that value to relax the logjam at the 2 and shore up a bit the very thin 3 position.
IMO, the backcourt rotation right now most likely would be: Tony/Neal start, Manu/Anderson backup. If Anderson is not really cutting it, you could play Corey/Manu as backup for small stretches, and we're likely to close games with Tony/Manu. I only see Corey playing if Manu/Tony need some extended rest or somebody is hurt.
I think that's still as good a backcourt rotation as any that included Hill. It might be a bit weaker on defense, but you also don't get a ball stopper in Hill.
The difference now though is at the 3. Richard will likely get the bulk of the minutes, but when he sits down we can actually play a legit SF instead of having to trot another guard out there. It's not going to be for a lot of minutes, but it allow our other players to play in the positions they play best at. You're also bringing somebody that seemingly can contribute without needing to get touches on the ball.
As I indicated above, Spurs still need to retool further if they want to be contenders. This move doesn't get them closer. I don't think it takes them farther either. They basically got seemingly better than D-League talent and more financial flexibility. There's just more work to do in the offseason.