A lion's share of the lost points/assists would come from Stephen Jackson, who's currently at 16.7/4.0. Parker is a scoring first point guard, his assists aren't a concern.
As for the rest, Hill picks up more slack due to increased minutes. The thing is the defense will be miles better w/ Finley and Bonner gone from the starting lineup. Stephen Jackson would improve that and take on the role of stopping the other teams' best wing player that always give the spurs' fits.
George Hill may not be able to even come close to Parker's offensive production. But that's ok, his defense is really what the spurs need more of.
Oh, and btw.... Parker is a not a franchise player, Tim Duncan is the spurs' franchise player, that's why Duncan is making franchise type money.
