What would really help both him and the team is if he moved more without the ball, specifically in two ways. First, if he could shoot off screens, that'd be huge for the entact offense's diversity and for Green's ability to shoulder a bigger load when Kawhi is out. It's one of those things he doesn't do often and isn't great at. But I don't see why it can't improve. Second, he needs to cut to the rim more. His first year starting, the Spurs opened up damned near every game by running a Green back-door play. Bringing those back (and alley-oops) would make it even harder for his man to play off him.
If the Spurs committed to making Green a set part of the offense rather than just a contingency, he'd probably average 12-15ppg (though on worse efficiency than usual). But that's not the plan, it seems. And with Kawhi, LMA and Gasol that makes sense. Plus, Danny would have to show he could handle the load and not just fade like he has for the past four years when Pop has him start the season with a new technique.