I don't think they'll go up because the usage opportunity won't be there, not because he won't improve. We have five players with a legitimate shot at running this offense through (Burke, Burks, Hayward, Hood, Dante).
I suppose you have a point there, and as I think about the extra passes to get an open shot it doesn't usually lead to an assist for the PG.
Parker averages 6apg yet the Spurs generally are tops or close to tops in Apg as a team.
We may get more open shots and hit more open shots but the assists will be spread out among the players and not rest solely on the PG if things are run right.