I suspect Ginobili's role will be declining the better the other two play and they will get opportunities to develop, both of them. Even Ginobili himself said this, but the trolls here with the "Simmons and Anderson are not good enough" schticks discount even what comes out of Ginobili's own mouth. He said both guys had worked really hard and deserve opportunities and that it would only be natural if they started playing much better and his minutes dwindled. Manu is not going to be playing more than 20 minutes, probably under any regular cir stances, unless fouls, or an injury situation, or someone clearly messing up requires it, which is not happening right now and hopefully it doesn't happen bc the team needs their young players to develop. In the past Pop would have put Manu at the end. He trusted Kyle in this case and got heady and solid play out of him. It was the right choice, Kyle got rebounds in the nick of time, boxed guys out, made good decisions on passes (setting up LMA for a post up over Barnes was Kyle recognizing a good shot opportunity and making a good decision).
It's in the team's interest to develop their youth and not rely on Manu that much and Pop will juggle minutes and situations to that end. They committed to Kyle another season, past this one and he will be developed for a role, but right now playing with Kiwi, it's not about him.