I just don't see this Parker for picks, or even Parker + RJ for pick + another decent role player working out very well. I haven't analyzed scenarios with many teams, but I can't see it working out even mediocre-ly well after considering the big picture.
Given the Spurs community loves Duncan and Ginobili, and at least knowing it's essentially a guarantee Duncan will retire a Spur, this franchise is still in win now mode. And I truly think they have one more decent chance to make a deep playoff run as long as they keep the big 3 together and ship out the incompetent role player heads like RJ, Bonner, and even Hill is exchangeable.
The problem with trading away Parker while in win now mode is that it leaves a massive scoring whole and shifts more of the burden to Ginobili, who we all know is streaky as . , currently in the NBA unless you are Dallas, you can't expect to go far while expecting one main player to do most of the scoring. Duncan obviously can't be relied upon to score very much at this stage of his career, you just can't feed his body the ball 15-17 times a night and expect him to produce very efficiently in the playoffs, game after game. If they traded Parker via this route, they likely wouldn't get another big scorer in return...a Ginobili/Duncan 70-75% Spurs offense won't cut it.
If they trade Parker, picks isn't the route, they need a solid scorer in return and RJ has to go. All things considered, it's best they don't touch the big 3 and instead modify the bench/role players.