Instead of bashing RJ, I have a different theory...
RJ has shown that he can score in different systems-I doubt there's much disagreement on that subject. Since that's the case, why not CHANGE the system just a tad to allow him more touches and space to drive.
Good coaches can coach a system and be pretty successful. Great coaches can draft/select players to fit their system and be very successful. Elite coaches can CHANGE or TWEAK their system to fit the players they're saddled with and win championships.
The problem isn't RJ, it's Pop. Pop's system isn't going to work unless he finds another Duncan (and the odds of that are slim to none). He needs to find a way to utilize the players he has (Blair included) in the best manner to win.